The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them...
The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 20 kg. What is the weight of the new person?
Answer/Solution
40
Steps/Work
Total increase in weight = 8 × 2.5 = 20
If x is the weight of the new person, total increase in weight = x−20
=> 20 = x - 20
=> x = 20 + 20= 40
Answer is D.
If x is the weight of the new person, total increase in weight = x−20
=> 20 = x - 20
=> x = 20 + 20= 40
Answer is D.