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Question

The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 numbers is 10. The last number is

A
40
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B
38
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C
48
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D
50
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Solution

The correct option is B 38
Sum of 20 numbers =20×12=240
Sum of first 12 numbers =11×12=132
Sum of next 7 numbers =10×7=70
Last number =240(132+70)=240202=38

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