Question

16. There are five boxes in a box hold. The weight of
the first box is 40 kg and the weight of the second
box is 50% higher than the weight of the third box,
whose weight is 25% higher than the first boxes'
weight. The fourth box at 150 kg is 50% heavier
than the fifth box. Find the difference in the aver-
age weight of the four heaviest boxes and the four
lightest boxes.
(a) 21.5 kg
(b) 25 kg
(c) 27.5 kg
(d) 22.5 kg​

Answer 1

Answer:

c) 27.5 kg

Explanation:

1st = 40kg

2nd = 3rd + 50% of 3rd = 75kg (3rd found in next step)

3rd = 40 + 25% of 40 = 50kg

4th = 150kg = 50% of 5th + 5th

5th = 100kg

average of four heaviest boxes = (75 + 50 + 150 + 100)/4 = 375/4 = 93.75

average of four lightest boxes = (40 + 50 + 75 + 100)/4 = 265/4 = 66.25

difference = 27.5kg