This is what I have:
12000+x+1.25x=48000
x+1.25x=48000-12000
x+1.25x=36000
x+x=36000/1.25
2x=28800
x=28800/2
x=14400
The correct answer is 16000, but what did I do wrong? It's probably something really simple and I've missed it.
Thanks.
2007-04-14 06:40:26 · 14 answers · asked by Sara 3 in Science & Mathematics ➔ Mathematics
Ok. The problem is what you did was on step 4, when you divided both sides by the 1.25. You can't do that unless you're dividing everything on both sides, whereas you left the first x as it was.
What I would have done, starting from step 3 would have been:
x + 1.25x = 3600
2.25x = 36000
x= 36000/2.25
x= 16000
what i did was add the two x's on the left side together before dividing. (think of just an "x" as having a coefficient of 1)
2007-04-14 06:45:28 · answer #1 · answered by ǝɔnɐs ǝɯosǝʍɐ Lazarus'd- DEI 6 · 2⤊ 0⤋
You did wrong at step 4:
x+1.25x=36000
x(1+1.25) = 36000
2.25 x = 36000
x = 36000/2.25
x = 16000
2007-04-14 06:45:14 · answer #2 · answered by roman_king1 4 · 1⤊ 0⤋
You screwed up on line 4.
x +1.25x = 36000 so far so good but next line should be:
2.25x = 36000 (1x + 1.25x)
x = 36000/2.25 = 16000 tadaaaaa
2007-04-14 07:04:10 · answer #3 · answered by o7966722446 1 · 1⤊ 0⤋
You cannot take off the 1.25 off the x when there is still another term on that side of the equation.
Instead, you should have added like terms.
So, continuing from step 4
2.25x=36000 (Since x is like 1x)
x=36000/2.25
x=16000.
2007-04-14 06:55:13 · answer #4 · answered by Anonymous · 1⤊ 0⤋
Your problem is that you didn't combine the x-terms before you divided by 1.25. This is what you should do:
(1)x+1.25x=36000
(1+1.25)x = 36000
2.25x=36000
x = 36000/2.25
x=16000
2007-04-14 06:49:38 · answer #5 · answered by mwebbshs 3 · 1⤊ 0⤋
12000+x+1.25x=48000
x+1.25x=48000-12000
x is also the same as 1x therefore...
1x+1.25x=36000
2.25x=36000
x=36000/2.25
x=16000
2007-04-14 06:51:18 · answer #6 · answered by coco 1 · 1⤊ 0⤋
Let me do it my way & see if we get the same answers...
12,000 + x + 1.25x = 48,000
Combine like terms & subtract 12,000 from both sides.
12,000 + 2.25x = 48,000 - 12,000
-12,000
2.25x = 36,000
Divide both sides by 2.25
x = 16,000
Had you combined the x + 1.25x instead of dividing, you would've gotten the correct answer. Remember to simplify the equation as much as you can before trying to solve it!!
2007-04-14 06:48:59 · answer #7 · answered by Katt Attack 3 · 1⤊ 0⤋
12000 + x + 1.25x = 48000
12000 + 2.25x = 48000
12000 + 2.25x - 12000 = 48000 - 12000
2.25x = 36000
2.25x / 2.25 = 36000 / 2.25
x = 36000 / 2.25
x = 16000
- - - - - - - -s-
2007-04-14 08:03:22 · answer #8 · answered by SAMUEL D 7 · 0⤊ 0⤋
12000+x+1.25x=48000
x+1.25x=48000-12000
x+1.25x=36000
x+x=36000/1.25 >>>> wrong wrong
2x=28800
x=28800/2
x=14400
the correct one is:
12000+x+1.25x=48000
x+1.25x=48000-12000
2.25x=36000
x=36000/2.25
x=1600
2007-04-14 06:55:14 · answer #9 · answered by suerena 2 · 1⤊ 0⤋
the first three steps were correct but the fourth step was wrong. It is 1+1.25 instead of just 1 .25 because you are adding another "x" to the problem. Other than that you did great. You should get the write answer after that.
2007-04-14 07:39:11 · answer #10 · answered by bhjesusfreak101 2 · 0⤊ 0⤋