Question

The mean of 15 numbers is 72. The mean of the first seven numbers is 60 and the mean of the last five numbers is 87. The eighth number equals 50% of the ninth number, and the tenth number is 50% more than the ninth number. What is the ninth number?

Q: Answer-The mean of 15 numbers is 72. The mean of the first seven numbers is 60 and the mean of the last fiv...

Let ninth number is x Eighth number 0.50x Tenth number 1.50x According to question x 0.50x 1.50x 15 72 7 60 5 87 225 Or, 3x 225 Or, x 75

A 75

B 48

C 90

D 55

E None of these

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The mean of 15 numbers is 72. The mean of the first seven numbers is 60 and the mean of the last five numbers is 87. The eighth number equals 50% of the ninth number, and the tenth number is 50% more than the ninth number. What is the ninth number?

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