Today Jim is twice as old as Fred and Sam is 2 years younger than Fred. Four years ago. Jim was 4 times as old as Sam. How old is Jim now?

Question

Accepted Answer

সঠিক উত্তর: । ব্যাখ্যা: ধরি, এখন Jim এর বয়স J, Fred এর F এবং Sam এর S\n$\therefore F = J/2$ এবং $F = S+2$\n$\Rightarrow J/2 = S+2 \Rightarrow S = J/2 - 2$\n4 years আগে, $J-4 = 4(S-4) \Rightarrow J-4 = 4S-16$\n$\Rightarrow J-4 = 4(J/2 - 2) - 16$\n$\Rightarrow J-4 = 2J - 8 - 16 \Rightarrow J-4 = 2J - 24 \Rightarrow J = 20$