Question

The length, width, and height of a rectangular box are three, four, and five feet respectively. Each length, width, and height are divided by 3,4, and 5 so that the rectangular box is divided into smaller cubes with sides of 1 foot. if one can of paint is needed to paint 12 square feet how many cans of paint are needed to paint the surface area of all smaller cubes?
A. 5
B. 15
C. 20
D. 25
E. 30

Answer 1

i think ans is d)25

Answer 2

No. of cubes is volume of rectangular box/volume of each cube
= 60
Surface area of each is 1 so total area to be painted is 60.

1 can for 12
So, 5 cans for 60.....