প্রশ্নঃ তপুর বর্তমান বয়স অপুর বয়সের দ্বিগুণ। ৩ বছর পূর্বে তপুর বয়স অপুর বয়সের তিনগুণ ছিল। তপুর বর্তমান বয়স কত?
উত্তরঃ
ধরি,
অপুর বর্তমান বয়স = ক
তপুর বর্তমান বয়স = ২ক
আবার,
তিন বছর পূর্বে অপুর বয়স ছিল = ক-৩
তিন বছর পূর্বে তপুর বয়স ছিল =২ক-৩ বা ৩(ক-৩)
অর্থাৎ
২ক - ৩ = ৩ (ক - ৩)
বা, ২ক - ৩ = ৩ক - ৯
বা, ৩ক- ২ক = ৯-৩
বা, ক=৬
সুতরাং , তপুর বর্তমান বয়স = ২ক =২*৬=১২ বছর
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