Where is your work? Help me understand the trouble you are having by seeing what you are doing wrong.
1. a is what percent of b?
2. What percent of a is 5?
3. 20 is what percent more than 15?
4. 2/5 is what percent of b?
5. 15 is what percent less than 20?
6. 1/2 is what percent more than 1/5?
7. 2/3 is what percent less than 1 1/2?
8. If a>b, what percent more than b is a?
9. if a<b, what percent less than b is a?
10. What is 40% more than 20%?
11. What is 40% more than 20% of 40?
12. What is 40% more than 40 less than 20% of 80?
13. What is a% less than b% more than c?
For percent problems I find it helpful to use this mnemonic:
What you do is you substitute numbers next to the words above into the proportion. So, for example:
Substitute a for the "is", a variable for "percent", and b for "of".1. a is what percent of b?
So a is percent of b.
Substitute 5 for the "is", a variable for "percent", and a for "of".2. What percent of a is 5?
So percent of a is 5.
20 is 5 more than 15, so this is also asking "5 is what percent of 15?" Substitute 5 for the "is", a variable for "percent", and 15 for "of".3. 20 is what percent more than 15?
x = 33.33...%
So 20 is 33.33...% more than 15.
That's all from me. You try the rest. Good luck!
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