Question

find the unit rate for each of the following. 11. 304 mi on 9.5 gal of gas 12. 450 mi on 20 gal of gas 13. $3.50 for 10 - min phone call 14. $86.40 for 720 kwh of electricity 15. $48 for 10 days of a classified ad 16. $340 for 40 hr of work 17. 24 lb turkey for 15 people 18. 5.5 lb hamburger for 12 people

Explanation:

Step1: Recall unit - rate formula

Unit rate = $\frac{\text{Quantity 1}}{\text{Quantity 2}}$, where Quantity 2 is made equal to 1.

Step2: Solve problem 11

For 304 mi on 9.5 gal of gas, unit rate = $\frac{304}{9.5}=32$ mi/gal.

Step3: Solve problem 12

For 450 mi on 20 gal of gas, unit rate = $\frac{450}{20}=22.5$ mi/gal.

Step4: Solve problem 13

For $3.50 for 10 - min phone call, unit rate = $\frac{3.50}{10}=0.35$ dollars/min.

Step5: Solve problem 14

For $86.40 for 720 kWh of electricity, unit rate = $\frac{86.40}{720}=0.12$ dollars/kWh.

Step6: Solve problem 15

For $48 for 10 days of a classified ad, unit rate = $\frac{48}{10}=4.8$ dollars/day.

Step7: Solve problem 16

For $340 for 40 hr of work, unit rate = $\frac{340}{40}=8.5$ dollars/hr.

Step8: Solve problem 17

For 24 lb turkey for 15 people, unit rate = $\frac{24}{15}=1.6$ lb/person.

Step9: Solve problem 18

For 5.5 lb hamburger for 12 people, unit rate = $\frac{5.5}{12}\approx0.46$ lb/person.

Answer:

1. 32 mi/gal
2. 22.5 mi/gal
3. 0.35 dollars/min
4. 0.12 dollars/kWh
5. 4.8 dollars/day
6. 8.5 dollars/hr
7. 1.6 lb/person
8. 0.46 lb/person