Multiple choice

There are five boxes in a store. The weight of the first box is 200 kg. and the weight of the second box is 20% higher than the weight of the third box whose weight is 25% higher than the first box. The fourth box of 350 kg. is 30% lower than the fifth box. The difference in average weight of the four heaviest boxes and the four lightest boxes is-

  1. 50 kg

  2. 60 kg

  3. 75 kg

  4. 90 kg

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Box 3 = 125% of 200 = 250 kg. Box 2 = 120% of 250 = 300 kg. Box 4 = 350 kg (given) and is 70% of Box 5, so Box 5 = 350/0.7 = 500 kg. Weights: 200, 250, 300, 350, 500 kg. Average of 4 heaviest (250,300,350,500) = 350 kg. Average of 4 lightest (200,250,300,350) = 275 kg. Difference = 75 kg.

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