Homework Help: math

Posted by HELP HELP HELP on Wednesday, March 7, 2012 at 7:58pm.

find each missing number.

1.)19/n = 0.76
2.)n:20 = 0.55
3.)n = 1:10 (n is a decimal)
4.) n% = 1:100
5.) n% = 33:100
6.) 99% (n is a decimal)
7.) n/25 = 17:25
8.) 41:n = 0.82
9.) n/25 = 0.08
10.) 21:n = 0.21

math - Bosnian, Wednesday, March 7, 2012 at 8:14pm
1.)

19 / n = 0.76 Multiply both sides by n

19 = n * 0.76 Divide both sides by 0.76

19 / 0.76 = n

25 = n

n = 25

2.)

n : 20 = 0.55 Multiply both sides by 20

n = 0.55 * 20

n = 11

3.)

n = 1 : 10

n = 0.1

4.)

n % = 1 : 100

1 % = 1 : 100

5.)

n % = 33 : 100

33 % = 33 : 100

6.)

99 % = 99 : 100 = 0.99

7. )

n / 25 = 17 : 25

Obviously n = 17

8. )

41 : n = 0.82 Multiply both sides by n

41 = n * 0.82 Divide both sides by 0.82

41 / 0.82 = n

50 = n

n = 50

9. )

n / 25 = 0.08 Multiply both sides by 25

n = 25 * 0.08

n = 2

10. )

21 : n = 0.21

Obviously n = 100 becouse

21 : 100 = 0.21

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