পিতা ও পুত্রের বর্তমান বয়সের সমষ্টি 60 বছর।5 বছর পূর্বে পিতার বয়স পুত্রের বয়সের চার গুণ ছিল।সাত

পিতা ও পুত্রের বর্তমান বয়সের সমষ্টি 60 বছর।5 বছর পূর্বে পিতার বয়স পুত্রের বয়সের চার গুণ ছিল।সাত বছর পর পিতার বয়স কত?
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