Page 408 - Basic College Mathematics with Early Integers

INTEGRATED REVIEW 385

Write each rate as a fraction in simplest form.
15.
15. 5 offices for every 20 graduate 16. 6 lights every 15 feet
assistants
16.

17. 64 computers every 100 households 18. 45 students for every 10 computers
17.

18.

Write each rate as a unit rate.
19.
19. 165 miles in 3 hours 20. 560 feet in 4 seconds

20.

21. 115 miles every 5 gallons 22. 112 teachers for 7 computers
21.

22.

Write each unit price, rounded to the nearest hundredth, and decide which is the better buy.
23.
23. Microwave popcorn: 24. AA batteries:
3 packs for $2.39 4 for $3.69
8 packs for $5.99 10 for $9.89 24.

25.

26.
Determine whether each proportion is true.

7 5 8.2 16.4
25. = 26. =
4 3 2 4 27.

28.

29.
Find the unknown number n in each proportion.
7
5 40 n 13 6 n 21 2
27. = 28. = 29. = 30. = 30.
3 n 10 4 11 5 n 3