# The cost of painting the outer surface of a closed cylindrical oil tank at 60 paisa per sq. cm. is Rs 237.60. The height of the tank is 6 times the radius of the base of the tank. Find height and radius of the tank.

2
by garima9cr3

## Answers

The Brainliest Answer!
2015-03-06T23:49:30+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let the radius = r
height is 6 times the radius,
so height, h= 6r

Rate of painting = 60 paisa per cm²  =Rs. 0.60 per cm²
total cost = Rs 237.60
Total surface area =

Height is 18cm and radius is 3cm.
thanksss........:)
:)
2015-03-07T03:43:23+05:30
let the radius = r
then the height = 6r

cost of painting= Rs 237.60
rate of painting = Rs0.60/cm²
outer surface area of cylinder = cost of painting/rate of painting
= 237.60/0.60
=396 cm²
2πrh = 396
2 x π x r x 6r = 396
12 x 22/7 x r² = 396
396 x 7
r² =      ------------
12 x 22
r² = 9
r = 3

radius = r = 3
height = 6r = 6 x 3 = 18