Of three numbers whose average is 60, first is one-fourth of sum of others. first number is

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4.Average

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Of the three numbers whose average is $60,$ the first is one-fourth of the sum of the others. The first number is

A

$30$

B

$36$

C

$42$

D

$45$

Solution

Let the First $no = x$

Sum of the other numbers $=4 x$

According to the question

$\frac{x+4 x}{3}=60 \Rightarrow 5 x=180 \Rightarrow x=36$

Standard 13

Quantitative Aptitude

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