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4.Average
medium
The average of $10$ mumbers is $7 .$ What will be the new average if each of the numbers is multiplied by $8 \,?$
A
$45$
B
$52$
C
$56$
D
$55$
Solution
The average of $10$ numbers $=7$
Total of $10$ numbers $=10 \times 7=70$
New total of $10$ numbers after each of given
numbers is multiplied by $8=70 \times 8=560$
$\therefore$ New average $=\frac{560}{10}=56$
Standard 13
Quantitative Aptitude