Ratios and Proportions

1. Ratios and Proportions

2. dp 100cd 100dp 100c p c Ratios and Proportions If p pencils cost c cents, how many pencils can be bought for ddollars? • cdp b) 100cdp c) d) e)

3. 1 1 27 3 Ratios and Proportions Consider the sequence 2, 6, 18, 54, 162, … If the 48th term is a and the 51st term is b, what is the value of b/a ? a) b) c) 9 d) 3 e) 27

4. 2h 2 2 5h 2 5 5h 5 2 5h Ratios and Proportions If Scott can mow 2/5 of a lawn each hour, how many lawns can he mow in h hours? a) b) c) h - d) e)

5. Ratios and Proportions If a secretary types 60 words per minute, how many minutes will he take to type 330 words?

6. 1 50 3 2 3 2 Ratios and Proportions If a various inversely with b, and b = 5 when a = 3, what is the value of b when a = 10? a) b) c) 2 d) e) 30

7. Ratios and Proportions 3 1 4 5 4 1 3 4 At Essex High School 100 students are taking chemistry and 80 students are taking biology. If 20 students are taking both chemistry and biology, what is the ratio of the number of students taking only chemistry to the number taking only biology? a) b) c) d) e) It cannot be determined from the info.

8. Ratios and Proportions • Looking at the table in the previous slide, what is the value of t, the total number of students on teams? • 450 b) 750 c) 1200 d) 1800 • e) It cannot be determined from the information given.

9. d 10p p 10d dp 10p d 10d p 10 Ratios and Proportions The value of 10 pounds of gold is d dollars, and a pound of gold has the same value as p pounds of silver. What is the value, in dollars, of one pound of silver? a) b) c) d) e)

10. Ratios and Proportions If a = 2b, 3b = 4c, and 5c = 6d, what is the ratio of a to d?

11. Ratios and Proportions Hoover High School has 840 students, and the ratio of the number of students taking Spanish to the number not taking Spanish is 4:3. How many of the studnts take Spanish? a) 280 b) 360 c) 480 d) 560 e) 630