How to solve: One method for solving these problems is outlined here. To see another method (cross-multiplying), click
here
.
Problem:
(
3
/
5
) = (
x
/
20
)
1. Find what the bottom was multiplied by:
5
*
4
=
20
Multiplying factor = 4
2. Use the multiplying factor to find the value of x:
3
/
5
= (
3
*
4
) /(
5
*
4
) =
12
/
20
3. Final Answer:
x = 12.
Here's one to try:
(Starts timer)
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