Chapter 4 Review

Solving Proportions

100

2    =     5

10         x

x=25

200

x   =   (x - 5)

8          6

x = 20 

300

Solve for x.

x = 14

400

Solve for y

y = 18

Solving percent problems

100

What percent of 40 is 30?

75%

200

Find 30% of 40.

x = 12

300

15% of what number is 24?

160

400

What is 150% of 14

21

Percent of change

100

The price of a sweater goes from $29.99 to $24.49. Find the percent increase or decrease

18% decrease

200

Bill was 4 ft tall in second grade and is 5.5 ft tall in ninth grade. Find the percent increase or decrease

37.5% increase

300

21 in. to 54 in.

157% increase

Probability

100

What is the probability of rolling an even number on a dice?

1/2 or 50%

200

Without replacement, what is the p(A then D)

12/210 or 10%

300

With replacement, what is p(B then C)

15/225 or 6.6%

400

Without replacement, what is the p(A then B then C)

60/2730 or 2.2%