Question

You have a rectangular prism whose cross section is a square with side length

3 cm. You need to know its length, but you do not have a ruler. Luckily, you have a calibrated container of water nearby. The container has marks that measure cubic centimeters of liquid. It appears to have 70 cubic centimeters of water in it, but when you submerge the prism into the water, the water level rises to the 115-cubic-centimeter mark. Determine how long your prism is.

Answer 1

side length = 5cm

Explanation:

The volume of the prism is:

V = l × w × h

But we only know the width and height which are both 3cm. See image.

We put it in the calibrated container (container with markings on it) We find out the volume is 45. Because 115 - 70 is 45.

Divide to find the missing length. See image.

Vol

= 3 × 3 × sidelength

V = 9s

45 = 9s

5 = s

see image.