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এক গোয়ালা তার 'n' সংখ্যক গাভীকে চার পুত্রের মধ্যে নিম্ন লিখিতভাবে বণ্টন করে দিল : প্রথম পুত্রকে ১/২ অংশ, দ্বিতীয় পুত্রকে ১/৪ অংশ, তৃতীয় পুত্রকে ১/৫ অংশ এবং বাকি ৭টি গাভী চতুর্থ পুত্রকে দিল। ঐ গোয়ালার গাভীর সংখ্যা কত ছিল?

১০০টি

১৪০টি

১৮০টি

২০০টি

ANSWER : 2

Descrption

<p style = "text - align: justify;"><span style = "color: #212529; font - family: bangla,  sans - serif;"><span style = "font - size: 18px; background - color: #ffffff;"><strong>প্রথম পুত্র পেল (</strong></span></span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n এর </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">১/২)  =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/২ টি</span></p>
<p style = "text - align: justify;"><span style = "color: #212529; font - family: bangla,  sans - serif;"><span style = "font - size: 18px; background - color: #ffffff;"><strong>দ্বিতীয় পুত্র পেল (</strong></span></span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n এর </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">১/</span><span style = "color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold; background - color: #ffffff;">৪</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">)  =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৪</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;"> টি</span></p>
<p style = "text - align: justify;"><span style = "color: #212529; font - family: bangla,  sans - serif;"><span style = "font - size: 18px; background - color: #ffffff;"><strong>তৃতীয় পুত্র পেল (</strong></span></span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n এর </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">১/৫</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">)  =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৫</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;"> টি</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">প্রশ্নমতে,  </span></p>
<p style = "text - align: justify;"><span style = "color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold; background - color: #ffffff;">n/২   +   </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৪   +   </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৫   +   ৭  =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">বা,  </span><span style = "color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold; background - color: #ffffff;">n/২   +   </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৪   +   </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n/৫ </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;"> =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n  -  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">৭</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">বা,  (১০</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n   +   ৫</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n   +   ৪</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n)/২০  =  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n  -  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">৭</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">বা,  ১৯</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;"> =  ২০(</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n  -  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">৭)</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">বা,  </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">৯</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;"> =  ২০</span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n  -  ১৪০</span></p>
<p style = "text - align: justify;"><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">সুতরাং </span><span style = "background - color: #ffffff; color: #212529; font - family: bangla,  sans - serif; font - size: 18px; font - weight: bold;">n  =  ১৪০</span></p>
<p style = "text - align: justify;"> </p>

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