Question

A roller 1.5m long has a diameter of 70cm. how many revolutions will it make to level a play ground measuring 50m × 33m

Answer 1

first find the curved surface area of the cylinder by the equation ....
base perimeter×height

over here that is...
2×22/7×35×150
$2 \times 22 \div 7 \times 150 \times 35 = 750 \times 44$
=>3300cm

then divide area of ground by area of cylinder
where3300 cm is 33m
=>50×33/33
=》50 REVOLUTION