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4.Average
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Of the three numbers, the average of the first and the second is greater than the average of the second and the third by $15 .$ What is the difference between the first and the third of the three numbers?
A
$15$
B
$45$
C
$60$
D
$30$
Solution
Let $x, y$ and $z$ be the numbers.
$\frac{x+y}{2}=\frac{y+z}{2}+15$
$\frac{x-z}{2}=15$
$x-z=2 \times 15=30$
Standard 13
Quantitative Aptitude
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