Answered

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What is the cost of 1 dozen carnations if 30 cost $50.00?

Sagot :

30/$50=12(the dozen)/x. x is the cost of a dozen carnations. Cross multiply for 30x=600. Divide both sides by 30 to get x by itself. x=20. $20 per dozen.
nashty
Let's create a ratio of amount to price

if
30:$50
then
12:x

30/12 = 2.5
50/2.5 = 20

30:$50
12:$20

Another way of looking at it is like this:

If 30, costs $50, then each 3 would cost $5. Four groups of 3 in 12. 4 * $5 = $20

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