Question

3. The mean of five numbers is 80. If one numbe
excluded, then the mean becomes 72. Find
excluded number.​

Answer 1

Let one number be x.

Let the sum of other number be y.

so, now

$\frac{x + y}{5} = 80$

$x + y = 400$

and when number is excluded

$\frac{y}{4} = 72$

$y = 288$

putting this value, in the first equation

$x + 288 = 400$

$x = 122$

so, the number is 122

Answer 2

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$\huge\mathfrak{Answer\:♡}$

$\mathcal{122}$

$\huge{\ddot{\smile}}$

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