# How do you determine whether the ratios are equivalent: #5/6#; #15/18#?

##### 1 Answer

Nov 4, 2016

Use:

#a/b = c/d" " <=> " "ad = bc#

#### Explanation:

If

#a/b = c/d" " <=> " "ad = bc#

In our example, (with

#5*18 = 90 = 6*15#

Therefore:

#5/6 = 15/18#