tdeshazier tdeshazier

22-02-2019
Mathematics

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the average of 3numbers is 10 if the sum of the numbersis 9 what is the third number

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acidxfairy acidxfairy

22-02-2019

Avg of 7 numbers = 9

Total of 7 numbers will be = 9 * 7 = 63

Avg of 3 of them is = 5

Total of those 3 will be = 3 * 5 = 15

Therefore the total of other 4 = 63 - 15 = 48

Ergo , avg of them = 48 / 4 = 12

Answer is 12

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