Job

Mathematics ( A- D)

The average weight of three mane A, B and C is 84 kg. Another man D joins the groups and the average now becomes 80 kg. If another man E, whose weight is 3 kg more than that of D, replace , A, then average weight of B, C, D and E becomes 79 Kb. What is the weight of A? (Average)

dsuc.created: 2 years ago | dsuc.updated: 2 years ago
dsuc.updated: 2 years ago

Avg. weight of A, B, C is 84kg.

Sum = 84 × 3 = 252kg.

Avg. weight of A, B, C, D is 80kg.

Sum=80×4= 320 kg.

D's weight=320-252= 68kg.

Weight of E = 68+3=71kg.

Weight of A+B+C+D+E=320+71=391 kg.

& the weight of B+C+D+E= 79x4=316 kg.

Weight of A= 391 - 316= 75 kg. ans. 

1 year ago

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