Question

Average of 20 numbers is 90. Average of first 8 numbers is 125 while average of last nine numbers is 40. If ninth number is 25% less than the tenth number which is equal to the eleventh numbers then find the tenth number.

Q: Answer-Average of 20 numbers is 90. Average of first 8 numbers is 125 while average of last nine numbers is...

Sum of ninth, tenth and eleventh number 20 90 8 125 9 40 440 Let tenth number x eleventh number So, ninth number 0.75 x 0.75x So, x 0.75x x 440 Or, 2.75x 440 Or, x 160

A 120

B 140

C 160

D 170

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Average of 20 numbers is 90. Average of first 8 numbers is 125 while average of last nine numbers is 40. If ninth number is 25% less than the tenth number which is equal to the eleventh numbers then find the tenth number.

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