Question 127
The average of 7 numbers is 8. If one number is added, their average is 9. Then the added number is
Solution
The average of 7 numbers = 8
=> Sum of 7 numbers = 7*8 = 56
Let added number be $$x$$
=> $$\frac{56 + x}{8} = 9$$
=> $$x = 72 - 56 = 16$$
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