QUESTION 17 The average weight of 4 boxes is 30 kg.
Qualcomm technical mcq question, verified with a worked answer. Free to practise - no sign-up.
The average weight of 4 boxes is 30 kg. If one box is removed, the average weight becomes 35 kg. What is the weight of the removed box?
**MCQ
Show answer & explanation
The total weight of 4 boxes is 4 × 30 = 120 kg. After removing one box, 3 boxes remain with average 35 kg, so their total is 3 × 35 = 105 kg. The removed box weighs 120 − 105 = 15 kg. Since the provided options are nonsensical (measured in 'days' instead of kg), the mathematically correct answer is 15 kg, which does not match any option—indicating a corrupted question.
Step-by-step Derivation:
Step 1: Total weight of 4 boxes = Average × Count = 30 kg × 4 = 120 kg
Step 2: Total weight of remaining 3 boxes = 35 kg × 3 = 105 kg
Step 3: Weight of removed box = 120 kg − 105 kg = 15 kg
Note: The provided options (30.0 days, 18.0 days, 37.5 days, 24.0 days) are invalid because they use 'days' as a unit instead of 'kg', and none equals 15 kg. The question data is corrupted.