The average mass of 5 boxes loaded onto a Singapore Post delivery van is 7.2 kg. After 1 box is removed, the average mass of the remaining 4 boxes drops to 6.8 kg. Find the mass of the removed box.
Show Worked Solution
Worked Solution
Step 1: Find the total mass of all 5 boxes.
Total of 5 = 7.2 × 5 = 36 kg.
Step 2: Find the total mass of the 4 remaining boxes.
Total of 4 = 6.8 × 4 = 27.2 kg.
Step 3: The removed box's mass = old total − new total.
36 − 27.2 = 8.8 kg.
Final answer: the removed box weighs 8.8 kg.
Answer: 8.8 kg
Correct answer: 8.8 kg
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