Can someone help me with math homework(percentages)?

Question

i need help doing percentages i don't get them at all, i have three examples that should help me with rest with your help

1)25% of (?) =18

2)6% of 340 = (?)

3)15= (?)% of 20

plz describe your steps....

Answer 1

The words "per cent" mean "divide by 100", and the word "of" means "multiply". So:

1) 25% of what = 18

25/100 * x = 18

x = 18*100/25 = 72

2) 6% of 340 = what

6/100 * 340 = x

20.4 = x

Can you get the third one now?

Answer 2

1) 25 % of x = 18
25/100 x = 18
x = 18 (100/25)
x = 72

2) 6% 0f 340
= 6/100 * 340
= 20.4

3) 15 = x% * 20
x/100 * 20 = 15
20x/100 = 15
20x = 15(100)
20x = 1500
x = 1500/20
x = 75

1) 72

2) 20.4

3) 75

Answer 3

1) 25% of x = 18 means 0.25x = 18, so x=18/0.25=18*4=72.
2) 6% of 340 = 0.06*340 = 20.4
3) x% of 20 = 15 means (x/100)20 = 15, or x/5=15, meaning x=75. That is, 75% of 20 = 15.

Answer 4

1) 25% x=18
.25x=18
x=18*4=72

2) 6% of 340=x
.06*340=x=20.4

3) 15=x% of 20
15=20x
x=15/20=.75=75%

Answer 5

for the 1st problem
you have to divide the number by the percentage, then multiply by 100. ex: 18 Divided by 25= .72 times 100 = 72
2nd problem divide 340 by 100, then multiply by 6. ex: 340 Divided by 100 = 3.4 times 6= 20.4
3rd problem divide 15 (the smaller #) by 20 ex: 15 divided by 20= .75, or 75%
sorry if you're still confused! math can be hard- hang in there!
if nothing here helps, ask your teacher for extra help or see if your school offers tutor help. good luck!!!

Answer 6

just put a variable in place of the "?".

1) 25% of x = 18 --> 25% of somthing equals 25 hundreds of it, so multipy by 0.25:

0.25x=18 --> now divide both sides by 0.25 to solve for x:

(0.25x)/0.25=18/0.25

x=72

ANSWER: 25% of 72 = 18

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2) 6% of 340 = x --> remember a percentage of something is that number multiplied by the decimal equivalent:

340(0.06) = x

x = 20.4

ANSWER: 6% of 340 = 20.4

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3) 15 = x% of 20 -->let x be a decimal equivalent here, until we convert it:

15 = 20x --> divide boths sides by 20 to solve for x:

15/20 = (20x)/20

x = 0.6 --> convert 0.60 to a percentage, which would be 60%

ANSWER: 15 = 60% of 20

Answer 7

1).
18/25%=72
2).
340*6%=20.4
3).
(15/20)*100=75%

Answer 8

1. 72
2. 20.4%
3. 75%