Question 64

Average of 9 numbers is 20. If a number 30 is also included, then what will be the average of these 10 numbers?

Solution

Average of 9 numbers = 20

=> Total sum of the numbers = $$(20\times9)=180$$

New included number = 30

New average = $$\frac{180+30}{10}$$

= $$\frac{210}{10}=21$$

=> Ans - (B)


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