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© examsnet.com
Question : 3
Total: 40
The average of 15 numbers is 115. If the average of the first eight numbers is 111 and that of the last 8 numbers is 120, what is the middle number?
121
120
123
124
125
Validate
Solution:
Total of 15 numbers = 115 × 15 = 1,725
Total of the first 8 numbers = 111 × 8 = 888
Total of the last 8 numbers = 120 × 8 = 960
Total of 16 numbers = 1,848
∴ Middle number = 1,848 - 1,725 = 123
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