3 boxes have some average weight. When one box which weights 89 kg is replaced by another box, the average weight increases by 5 kg. How much the new box weighs?

(A) 109 kg
(B) 94 kg
(C) 104 kg
(D) 84 kg

Solution:
A+ B + 89 /3= X
A+ B + 89 = 3x
A+ B = 3x – 89
A+B+C /3= X + 5
A+ B = C = 3x + 15 … (1)
Put A+ B = 3x – 89 in eq. (1)
3x – 89 + C = 3x + 15
C=3x+ 15-3x+89
C = 104

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