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A ratio compares two amounts. If there are 3 cats and 5 dogs, the ratio of cats to dogs is 3:5.
Equivalent ratios are like equivalent fractions: 3:5 = 6:10 = 9:15.
A unit rate tells how much for one: 120 miles in 3 hours is 40 miles per hour.
Use unit rates to compare deals: 4 apples for 2 dollars is 0.50 dollars per apple.
