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Question
Each boy contributed money equal to the number of girls and each girl contributed money equal to the number of boys in a class of 60 students. If the total contribution thus collected is Tk. 1,600, how many boys are there in the class?
30
25
50
20.5
None of these
ANSWER : 5
Descrption
<p>Hints: ছেলেদের সংখ্যা x এবং মেয়েদের সংখ্যা y হলে</p> <p>x + y = 60................ (1)</p> <p>এবং, xy + xy = 2xy = 1600</p> <p> xy = 800 </p> <p>তাহলে, x - y = √(x + y)<sup>2</sup> - 4xy</p> <p> = √(60)<sup>2</sup> - 4 × 800</p> <p>x - y = 20............. (2)</p> <p>(1) and (2) no equation</p> <p>2x = 60 + 20</p> <p>2x = 80</p> <p>x = 40</p>
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