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Four out of 28 students had to go to summer school. What is the ratio of students who did not have to go to summer school expressed, in its lowest terms?

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First of all, remember that you are solving for the number of students who did not have to go to summer school. If 4 students did have to go, out of 28, then 24 students did not have to go. 28 - 4 = 24 To express this as a ratio, simply treat 24 as the numerator and 28 as denominator: $4087_w90_h38.png$ Divide both numerator and denominator by 4 to reduce the ratio or fraction to the lowest terms. TIP: When reducing a fraction to its lowest terms, choose the biggest common number that can be used to divide both numbers. In this case, it is 4 because 24 can be divided by 4, and 28 can be divided by 4. Also, remember that ratios can be expressed in three ways: * in words—6 to 7 * using a colon—6:7 * and as a fraction— $1300_w9_h37.png$ These are all equivalent forms of this ratio. Sometimes it's easier to work with ratios when expressed as fractions.
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