The average weight of A, B and C is 45 kg. If the average weight of A and B is 40 kg and that of B and C is 43 kg, then the weight of B Is.....
সমাধান
সঠিক উত্তর: Option B
দেওয়া আছে,
(A+B+C)/3 = 45
⇒(A+B+C) = 135 ....(i)
আবার,
(A+B)/2= 40
⇒(A+B) = 80........(ii)
এবং, (B+C)/2 = 43
⇒B+C = 86 ........(iii)
(ii)+(iii)⇒
A+B+B+C = 80+86
⇒ A+ 2B + C = 166 ....(iv)
(iv)-(i) ⇒
B = 166 - 135
⇒ B = 31
∴ B এর ওজন = 31 kg
(A+B+C)/3 = 45
⇒(A+B+C) = 135 ....(i)
আবার,
(A+B)/2= 40
⇒(A+B) = 80........(ii)
এবং, (B+C)/2 = 43
⇒B+C = 86 ........(iii)
(ii)+(iii)⇒
A+B+B+C = 80+86
⇒ A+ 2B + C = 166 ....(iv)
(iv)-(i) ⇒
B = 166 - 135
⇒ B = 31
∴ B এর ওজন = 31 kg
