Question

Add all odd numbers between 20 and 30 and divide the result by 25

Answer 1

Step 1

Odd numbers between $20\times 30$

$\stackrel{2}{2}1$
$232527+\underset{–}{29}\underset{–}{125}$

21 + 23 + 25 + 27 + 29 = 125

Step 2

Divide 125 by 25

$\frac{125}{25}$ common factor 5

$=\frac{\stackrel{25}{\text{/}125}}{\underset{5}{\text{/}25}}=\frac{25}{5}=5$

Answer : 5