Use The Percent Porportion to solve each problem.
1)16 is what percent of 40?
2)21 is 30% of what number?
3)What is 80% of 130?
4)What percent of 5 is 14?
2007-10-22 10:56:49 · 8 answers · asked by haaaaahaaaa! 1 in Science & Mathematics ➔ Mathematics
1. 16/40 ( solve as a porportion ) ( sorry cant line up division brackets it is supposed to be 16 over forty)
16__ x__
40 100 Multiply 16 x 100 to get 1600 then divide by 40x to get x= 40
2. 21__ 30__
x 100 Multiply 21x100 to get 2,100, then divide by 30 to get x=70.
3. x__ 80__
130 100 Multiply 80x 130 to get 10,400 then divide by 100 to get 104.
4. x_ 14_
5 100 Multiply 14 by 5 to get 70, then divide by 100 to get .7
In other words,
1. 40%
2. 70
3. 104
4. .7%
2007-10-22 11:12:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1)16 is what percent of 40 you can put that as the following
16/40=x/100 here you can cross multiply
1600=40x
40=x so 40%
2)21 is 30% of what number you can write that as
21/x=30/100 cross multiply
2100=30x
70=x
3)What is 80% of 130?
x/130=80/100
100x=10400
x=104
4)What percent of 5 is 14?
14/5=x/100
5x=1400
x=280 so 280%
2007-10-22 18:04:57 · answer #2 · answered by jj 3 · 0⤊ 0⤋
First of all, you shouldn't be asking for answers, but I'll help you.
1)40% because 40x=16 and you get .4=x
2)70 because 21=.3x and you get 70=x
3)104 because 80% of 130 is 104
4)280% because 5x=14 and you get 2.8=x
*Note: if you didn't already know, you multiply the x's by 100 in the percentage problems and then add a percent.
2007-10-22 18:04:10 · answer #3 · answered by Alice Seno 2 · 0⤊ 0⤋
16 is 40% of 40
21 is 30% of x 21/1 x 10/3= 70
8/10 x 130/1= 104
% of 5=14 14 is % of 5 14/5=2.8 x 100= 280%
2007-10-22 18:09:33 · answer #4 · answered by Dave aka Spider Monkey 7 · 0⤊ 1⤋
1) 16 = 40x
Divide each side by 40 and you will get .4. Move the decimal two places to the right and your final answer will be 40%.
2) 21 = .3x
Divide each side by .3 and you will get 70 as your final answer.
3) x = .8 x 130
Multiply the .8 and 130 and you will get 104 as your final answer.
4) 5x = 14
Divide each side by 5 and you will get 2.8. Move the decimal two places to the right and your final answer will be 280%.
2007-10-22 18:02:53 · answer #5 · answered by dcam90 3 · 0⤊ 0⤋
Think of setting up the problem as %/100 = is/of
1) 40 %
2) 100
3) 104
4) 280 %
2007-10-22 18:04:22 · answer #6 · answered by Jessie 3 · 0⤊ 0⤋
1) 16 = 40x
.4=x
40%.
2) 21 = .3x
70=x
3) x = .8 x 130
x=104
4) 5x = 14
x=2.8
280%
2007-10-22 18:05:40 · answer #7 · answered by Lanetta 3 · 0⤊ 0⤋
it is actually pretty easy if you know how to set up a porportion
1.40%
2.70
3.104
4.35.71
2007-10-22 18:11:45 · answer #8 · answered by Sammi 2 · 0⤊ 1⤋