when a number is decreased by 20% of itself, the result is 20. I know the answer is 25 but i dont know how to write it in algebraic form.
x - .20 = 20 ????
2007-05-30 14:11:27 · 9 answers · asked by dumbblonde 2 in Science & Mathematics ➔ Mathematics
let x be the number
the number is decreased by 20% of that number
x - .2x = 20
now just solve and you should get 25
2007-05-30 14:15:50 · answer #1 · answered by 7 · 0⤊ 0⤋
You were very close
x - 20% x = 20 which is the same as saying
x - 0.20 x = 20
0.80 x = 20
x = 20 /0.80 = 25
2007-05-30 21:16:30 · answer #2 · answered by Trini 3 · 0⤊ 0⤋
x - .2x =20 ==> 0.8x = 20 ==> 20/0.8 = 25
2007-05-30 21:51:07 · answer #3 · answered by iiashley 1 · 0⤊ 0⤋
x-0.2x=20----> 0.8x = 20 ---> x=20/0.8 = 25
2007-05-30 21:21:41 · answer #4 · answered by kuppai 1 · 0⤊ 0⤋
x - 0.2x = 20
x(1 - 0.2) = 20
x = 20/0.8
x = 25
2007-05-30 21:33:32 · answer #5 · answered by Helmut 7 · 0⤊ 0⤋
x - .2x = 20
2007-05-30 21:15:02 · answer #6 · answered by cscokid77 3 · 0⤊ 0⤋
You're close
x - 0.20x = 20
0.8x = 20
x = 25
2007-05-30 21:15:28 · answer #7 · answered by mwebbshs 3 · 0⤊ 0⤋
x-.2x=20
If it were x-.20=20, that would mean x=19.8
2007-05-30 21:14:00 · answer #8 · answered by cheesysoundeffectz 2 · 0⤊ 1⤋
you got it!
2007-05-30 21:23:11 · answer #9 · answered by Anonymous · 0⤊ 0⤋