Solve x/42=3/7 using two different strategies.

You can solve this type of question two ways:

First cross multiply:

x = 3

42 7

(42) (3) = (7) (x)

This becomes:

126 = 7x

To solve for x divide both sides by 7 and you get x = 18

The other way to solve it is to think, what do I need to do to get x all by itself?

Since it's being divided by 42, you need to multiply each side of the equation by 42.

42 * x = 3 * 42

42 7

This leaves you with x = (42*3) / 2

This simplifies to x = 18