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

Question

Tonycoolkid21 · Answer

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

Tonycoolkid21 · Answer

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

Tonycoolkid21 · Answer

did i do good?

Jocelynnn · Answer

@tonycoolkid21 wrote:

did i do good?

yes u did lol

Tonycoolkid21 · Answer

medal me i helped you