Question

Average of 17 numbers is 81. If the average of the first

Q: Answer-Average of 17 numbers is 81. If the average of the first six and last eight numbers is 91.5 and 71.5...

ATQ, Let the eighth number be 10x. So, the ninth number 1.20 10x 12x. Tenth number 8509 1100 12x 34x3. So, 10x 12x 34x3 81 17 6 91.5 8 71.5 255. Or, 100x3 255. Or, x 7.65. So, the ninth number 12 7.65 91.8.

six and last eight numbers is 91.5 and 71.5 respectively, and if the ninth number is 20% more than the eighth number and the tenth number is (50/9)% less than the ninth number, then find the ninth number.

A 50.7

B 91.8

C 11.45

D 37.9

E None of these

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