Question

on the first four days of the week, Ella took 30 min 28 min 34 min and 31 min to get to school if the average for the week is 31 how long did it take Ella o go o school on Friday

Answer 1

It took 32 minutes for Ella to go to school on Friday.

Step-by-step explanation:

Time for first four days in minutes,

30,28,34,31

Let x be the time on Friday

Average = 31 min

As we know

$Average = \frac{Sum\ of\ term}{No.\ of\ terms}\\Average=\frac{30+28+34+31+x}{5}\\31=\frac{123+x}{5}$

Multiplying both sides by 5;

$5*31=\frac{123+x}{5}*5\\155=123+x\\x+123=155\\x=155-123\\x=32$

It took 32 minutes for Ella to go to school on Friday.

Keywords: Average, Addition

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