the average of 10 numbers is 7. what will be the new average if each of the numbers is multiplied by 8?

A 45
B 52
C 56
D 55

Correct Answer: 56

The sum is = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>10</mn><mo>&#xD7;</mo><mn>7</mn><mo> = </mo><mn>70</mn></math>New Sum is = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>70</mn><mo>&#xD7;</mo><mn>8</mn><mo> = </mo><mn>560</mn></math>and new average Sum is = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>560</mn><mo>&#xF7;</mo><mn>10</mn><mo> = </mo><mn>56</mn></math>
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