The average weight of a group of 5 boys is 26. If we replace a boy of weight 25 in the group with another boy so that new average increases by 3, find the weight of the new boy.
Answer & explanation
Correct answer: option 4
Total weight of group of 5 boys: 130
According to the question,
130 - 25 + x = (26 + 3) * 5
105 + x = 29 * 5
x = 145 - 105
x = 40