Question

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

Answer 1

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

Answer 2

Cost of 20 articles
= 90 Rs

Cost of 1 article
= 90 / 20
= 4.5 Rs


Cost of 9 articles
= 9 X 4.5
= 40.5 Rs

Answer 3

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Answer 4

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