Question
Average weight of 50 boxes is 22 kg. Two more boxes of weights (z + 7) and (z - 5) are added and the average becomes 22.5 kg. Find (z - 18).
Solution
52 × 22.5 − 50 × 22 = z + 7 + z − 5
2z + 2 = 1170 − 1100 = 70
2z = 68
z = 34
z − 18 = 34 – 18 = 16
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