Question

Average of 8 numbers is 30. If average of first four and

Let fifth and sixth numbers be 7x and 5x, respectively. So, 7x 5x 30 8 20 7 50 5 60 Or, 12x 60 Or, x 5 So, fifth number 5 7 35

last two numbers is 20 and 50, respectively then find the fifth number given that ratio of fifth and sixth number is 7:5, respectively.

A 45

B 25

C 55

D 35

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Solution