Question

Express in the form 1:n 5:15

Answer 1

Answer: n = 3

Explanation:

You could treat these two ratios as fractions

`(1)/(n) =(5)/(15)`

There are multiple ways in which you can do this, but Im going to teach you the most reliable way. Do cross multiplication by multiplying each side by the others denominators. 15 x 1 and n x 5 to get:

5n = 15

Divide each side by 5 to get n = 3