Question

Find the average of 7 numbers?
7
the
verage of the first five is
6. numbers if the sum of the first four is 76 and the sum of the last three is 78.
Hint: Average of 7 numbers = Sum of first four numbers + Sum of last three numbers​

Answer 1

Answer:

Say the seven numbers are a, b, c, d, e, f, g.

=> a + b + c + d + e + f + g = 7 x 20 = 140 ---(1)

=> a + b + c + d = 4 x 19 = 76 ---(2)

=> d + e + f + g = 4 x 24 = 96 ---(3)

Adding (2) and (3), we get,

=> (a + b + c +d + e + f + g) + d = 76 + 96 = 172 ---(4)

Plugging-in the value of (a + b + c +d + e + f + g) from (1), we get,

=> 140 + d = 172

=> [spoiler]d = 32[/spoiler]

Step-by-step explanation:

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