show your work please, its appreciated...thanks
2006-10-21 18:10:27 · 9 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Let x be the number. Then 20% of x is 0.2x.
You have x - 0.2x = 20. Factor out an x, and get x(1-0.2) = 20, or 0.8x = 20. Therefore, x = 20/0.8 = 25.
2006-10-21 18:13:32 · answer #1 · answered by James L 5 · 0⤊ 0⤋
is/of =%/100
So if it was decreased by 20% then 80% of the original is 20 so....
20/x = 80/100
cross multiply
2000= 80x
Factor out the X
2000/80
X=25
the equsion can be used for any % math problem when you have 2 of the variables to get the third. :)
2006-10-22 01:19:17 · answer #2 · answered by mschewie00 2 · 0⤊ 0⤋
James L is correctomundo. X = 25
2006-10-22 01:20:43 · answer #3 · answered by Jugglingmidget06 4 · 0⤊ 0⤋
20.
2006-10-22 01:18:22 · answer #4 · answered by johnjoe 3 · 0⤊ 2⤋
25. 5x5=25 minus 20% (one-fifth) =20.
2006-10-22 01:13:45 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Let x be the unknown #
x-0.20x=20
0.8x=20
x=20/0.8
x=25
2006-10-22 01:20:50 · answer #6 · answered by Dana ♪ 3 · 0⤊ 0⤋
x-20/100x; 100x-20x/100=80x/100=20; 80x=2000; x=25
2006-10-22 01:20:03 · answer #7 · answered by Anonymous · 0⤊ 0⤋
25 without a doubt.
2006-10-22 01:25:53 · answer #8 · answered by Ted T 5 · 0⤊ 0⤋
The james l solution (the v first one) is the most elegant.
2006-10-22 02:07:30 · answer #9 · answered by Rajesh Kochhar 6 · 0⤊ 0⤋