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24 vote

3 numbers whose average is 112, the first number is 1/6th the sum of other 2. What is the first number?

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3 numbers whose average is 112, the first number is 1/6th the sum of other 2. What is the first number?


1). 45
2). 30
3). 15
4). 48


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1 answers

18 vote
Answered by on | Votes 18 |

? Average of three numbers is 112

This means sum of 3 numbers is = 112 × 3 = 336

Let the first number be X

Then X = (1/6) × (Sum of other two numbers) = (1/6) × (336 - X)

⇒ X + X/6 = 336/6

⇒ X = 336/7 = 48

∴ First number = 48

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