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# How do you compute a ratio?

Updated: 10/10/2023

Wiki User

15y ago

A ratio can be expressed as an equivalent ratio by multiplying or dividing each side of the ratio by the same number.

Examples:

The ratio 4:5 is the same as 8:10 or 12:15

The ratio 3:6 is the same as the ratio 1:2

Wiki User

12y ago

Wiki User

12y ago

it is just like doing proportion. you set up the fractions, do their cross products, and then divide them by the number that is with the variable.

Example: Willie runs 5 miles in 45 minutes. If Willie runs at the same rate, how far can he run in 72 minutes?

5 mi. X mi.

------ = ------

45 min. 72 min.

45 x X= 45X (cross out the 45) 72 x 5= 360 (divide 360 by 45)

------ ------

45 45

And then, when you finish these steps, your answer is: X= 8 mi.

Wiki User

15y ago

I think you're rather confused. It takes two numbers to make a ratio, also known as a fraction. The first or top number is called the numerator and the second or botton number is called the denominator. A ratio's value is equal to the numerator divided by the denominator, and you need two numbers to divide. However, any number divided by one is that number, so the ratio of x/1 could maybe be called "the ratio of x", though that's a poor way of saying it.

Wiki User

15y ago

The ratio of the number of trees in the orchard is 2:3:6. If there are 36 trees in the orchard, What is the large number of trees?

Wiki User

11y ago

(original- after price)/original x 100

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