Question

Average of 8 numbers is 80. If average of first four and

Let fifth and sixth numbers be 7x and 5x, respectively. So, 7x 5x 80 8 70 7 60 5 240 Or, 12x 240 Or, x 20 So, fifth number 20 7 140

last two numbers is 70 and 60, respectively then find the fifth number given that ratio of fifth and sixth number is 7:5, respectively.

A 140

B 130

C 120

D 125

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