1. 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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By: anil on 05 May 2019 01.57 am
Given that the average of first 3 = 15 and average of last 3 is = 16 Using average = $$frac{sum}{number of elements}$$ Sum of first 3 numbers = 15x3=45 Sum of last 3 numbers = 16x3=48 last number is given as=19 so sum of last two numbers = 48-19 = 29 so first number = 45-29 = 16
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