Ehsan was preparing to make a tape from some of his favourite songs. He noticed that Hadi's song was 1 minute longer than Bonna's song. Duration of Niaj's song was 1 minute shorter than twice the duration of Bonna's song. If the total time for these songs is 12 minutes, how long is Niaj's song?

Question

Accepted Answer

সঠিক উত্তর: । ব্যাখ্যা: $N = 2B - 1$ and $H = B + 1$\n$\therefore N + H + B = 12$\n$\Rightarrow (2B - 1) + (B + 1) + B = 12$\n$\Rightarrow 4B = 12$\n$\Rightarrow B = 3$ minutes\nঅর্থাৎ, $N = 2B - 1 = 2(3) - 1 = 5$ minutes