If 20 articles cost 90, then the cost of 9 articles is ?

Answer 1

Hi Mohammed,

You can solve this problem in more than one way.

One way is:

Find the unit rate first (or the cost of 1 article) . Then multiply the unit rate by 9 to find the cost of 9 articles.

$90 = x

20 articles 1 article

$90 ÷20 = $4.50

20 articles ÷ 20 1 article

$4.50 • 9 = $40.50 for 9 articles