Question 54
The average of 12 numbers is 15, and the average of the first four numbers is 13. What is the average of the remaining numbers?
Solution
The average of 12 numbers is 15.
Sum of 12 numbers = $$15\times12$$ = 180
The average of the first four numbers is 13.
Sum of first four numbers = $$13\times4$$ = 52
Average of the remaining numbers = $$\frac{180-52}{12-4}$$
= $$\frac{128}{8}$$
= 16
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