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4.Average
hard
Of the $3$ members whose average is $22 .$ What is the first number ?
A
$16$
B
$20$
C
$22$
D
$18$
Solution
Sum of $3$ Numbers $=22 \times 3=66$
Let the Sum of $2^{\text {nd }}$ and third No. be $x$
$\therefore 1^{\text {st }}$ Number $\frac{3}{8} x$
$\frac{3}{8} x+x=66$
$3 x+8 x=66 \times 8$
$11 x=528$
$x=48$
$\therefore$ The first Number is $\frac{3}{8} \times 48=18$
Standard 13
Quantitative Aptitude
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