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Out of four number, the average of first three is 15 and that of the last three is 16, if the last number is 19, the first is?

15
16
18
19

Correct Answer: 16

Explanation:

Sum of four number = ( 15 x 3 + 19 ) = 64
Sum of last three number = ( 16 x 3 ) = 48
∴ first number = ( 64 – 48 ) = 16

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