Gujarati
Hindi
4.Average
medium

The average of $20$ numbers is $30$ and that of other $30$ numbers is $50 .$ What is the average of all the numbers.

Solution

Average of all the numbers $=\frac{20 \times 30+30 \times 50}{50}$

$=\frac{600+1500}{50}=\frac{2100}{50}$

$=42$

Std 13
Quantitative Aptitude

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