Question

Garden roller has a circumference of 3m how many Revolution does it make moving 21m

Answer 1

it can make 7 revolution
because
$21 \div 3 = 7$

Answer 2

first, we need to calculate the distance covered in one rotation
we have given that it travels 3m in one rotation than 
to travel 21 m we have
1rotation=3m
xrotation=21m
7rotation 
pls mark the crown button