Pre-Algebra Demystified

SOLUTION

22 %

100 %

¼

17 : 6

B

22B¼ 17 : 6  100

22B¼ 1760

22 B

22

¼

1760

22

B¼ 80

PRACTICE

Solve each percent problem by using a proportion.

1. Find 54% of 80.


2. 6 is what percent of 25?


3. 25% of what number is 64?


4. 24 is what percent of 120?


5. Find 92% of 450.


6. 42% of what number is 35.28?


7. 15 is what percent of 60?


8. Find 36% of 72.


9. 18% of what number is 10.08?


10. 12 is what percent of 30?

ANSWERS

1. 43.2


2. 24%


3. 256


4. 20%


5. 414


6. 84


7. 25%


8. 25.92


9. 56


10. 40%

Quiz

1. Find the ratio of 2 to 7.

160 CHAPTER 8 Ratio and Proportion