Question

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.

Answer 1

x - sale price
y - original price


`x:y=1:3 \\x:81=1:3 \\3x=81* 1 \\ \\x= (81)/(3) \\ \\x=27`