Question

Two tennis balls and one cube weigh 152 g. One tennis ball and one cube weigh 96g. All three tennis balls weigh the same, and both cubes weigh the same. What is the weigh of one cube?

Answer 1

c = 40 g

Explanation:

Let's call the tennis balls and the cube

The three balls weigh the same.

Both cubes weigh the same

We know that two balls and a cube weigh 152g.

This is:

2p + c = 152 (i)

A ball and a bucket weigh 96 g.

This is:

p + c = 96 (ii)

Then substitute (ii) in (i)

2p + (96-p) = 152

p +96 = 152

p = 56 (iii)

Now substitute (iii) in (ii)

c = 96 -56

Finally

c = 40 g