Question

The mean of 5 numbers is 40. If the mean of the first 2 numbers is 45 and that of last 2 is 42. Find the third number.

Answer 1

Answer:

$26$

Step-by-step explanation:

$total \: of \: numbers \: would \: be \\ 5 \times 40 = 200 \\ first \: 2 \: numbers \: total \: is \\ 2 \times 45 = 90 \\ last \: 2 \: numbers \: total \: is \\ 2 \times 42 = 84 \\ so \: third \: number \: would \: be \\ 200 - (90 + 84) \\ 200 - 174 = 26$

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