rmehellIsabelle rmehellIsabelle

24-11-2016
Mathematics

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The ratio of the sale price of a textbook to the original price is 1:3. The original price is $81. What is the sale price. Create a proportion to find out.

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alsteva alsteva

27-11-2016

x - sale price
y - original price

[tex]x:y=1:3 \\x:81=1:3 \\3x=81\times 1 \\ \\x= \frac{81}{3} \\ \\x=27[/tex]

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