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Out of four numbers, the average of the first three is 15 and that of the last three is 16. If the last number is 19, the first is
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- 19
- 15
- 16
- 18
- 19
Correct Option: C
Given , Sum of first 3 numbers = 15 × 3 = 45
⇒ a + b + c = 45 ,
last number = d = 19
and Sum of the last three numbers = 16 × 3 = 48
⇒ b + c + d = 48
⇒ b + c = 48 – 19 = 29
∴ a + b + c = 45
⇒ a = 45 – 29 = 16
