Average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers ?

A. 5
B. 7
C. 12
D. 17

A + B + C = 48

B + C + D = 45

A + D = 13

A – D = 3

A + D = 13

2D = 10

D = 5

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