The average of 10 numbers is 7. What will be the new average if each of the numbers is multiplied by 8?
A
45
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B
52
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C
56
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D
55
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Solution
The correct option is C 56 The average of 10 numbers = 7
Total of 10 numbers = 10×7=70
New total of 10 numbers after each of the given numbers is multiplied by 8=70×8=560 ∴ New average =56010=56