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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
