Question

The radius and height of a cylinder are in the ratio 5:7 and its volume is 4400 cm^3. Find the unit digit of height

Answer 1

Volume of a cylinder is pi r*2h
22/7.(5x)*2.7x=4400
Here 7 is canceled
So 25x*3=4400/22
25x*3=200
X*3=200/25=8
X=2

Height =7x =7(2)=14 cm
Radius =5x=5(2)=10 cm