1.

The average of 12 numbers is 52. The average of the first 4 numbers is 42 and the average of the next 5 numbers is 56. If the 10th number is 7 less than 11th number and the 12th number is 3 less than the 11th number, then what is the average of the 10th and 12th number?

A. 54
B. 57
C. 53
D. 52
Answer» C. 53


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