The unit rate of Mikayla and brie is 0.16 miles per minutes and 0.25 miles per minutes respectively.
Brie runs faster.
Unit rate
Mikayla
2 miles in 12 1/2 minutes
Unit rate = miles / minutes
= 2 ÷ 12 1/2
= 2 ÷ 25/2
= 2 × 2/25
= 4/25
= 0.16 miles per minutes
Brie
5 miles in 22 1/4 minutes
Unit rate = miles / minutes
= 5 ÷ 22 1/4
= 5 ÷ 89/4
= 5 × 4/89
= 20/89
= 0.25 miles per minutes
Lucy
4 4/5 pounds for $18.50
Unit rate = pounds / price
= 4 4/5 ÷ 18.50
= 24/5 ÷ 18.50
= 24/5 × 1/18.50
= 24/92.50
= $0.26 per pound
Sophie
3 1/2 pounds for $14.75
Unit rate = pounds / price
= 3 1/2 ÷ 14.75
= 7/2 ÷ 14.75
= 7/2 × 1/14.75
= 7/29.5
= $0.24 per pound
- Sophie got the better deal
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