Posted by **Alex** on Tuesday, October 8, 2013 at 7:17am.

Hi.. i'm a little confused on using proprtion equations to solve percent problem. can you check the following? Is there a different way to solve?

equation: is(part)/of(whatnumber)= %/100

1. What is 94% of 43?

x/43 = 94/100

100x = 43*94 (cross multiply)

100x = 4042

x = 4042/100

x = 40.42

2. 63 is what percent of 84?

63/84 = x/100

84x = 63*100

84x = 6300

x = 6300/84

x = 75%

3. 5% of what is 3.4?

3.4/x = 5/100

5x = 100*3.4

5x = 340

x = 340/8

x = 68

4. What is 5% of 28?

x/28 = 5/100

100x = 28*5

100x = 140

x = 140/100

x = 1.4

5. 15% of what is 6.3?

6.3/x = 15/100

15x = 100*6.3

15x = 630

x = 630/15

x = 42

6. 3.8 is what percent of 76?

3.8/76 = x/100

76x = 100*3.8

76x = 380

x = 380/76

x = 5

7. Find 64% of 48.

x/48 = 64/100

100x = 64*48

100x = 3072

x = 3072/100

x = 30.72

8. What percent of 90 is 6?

6/90 = x/100

90x = 6*100

90x = 600

x = 600/9

x = 66.67% ?

9. 105 is 5% of what number?

105/x = 5/100

5x = 105*100

5x = 10500

x = 10500/5

x = 2100 ?

10. What percent of 69 is 138?

138/69 = x/100

69x = 138*100

69x = 13800

x = 13800/69

x = 200

Thanks

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