Rocio has $150 and is SPENDING $10 per week, ed has $25 and is SAVING $15 every week. after how many weeks will they have the same amount?
2007-10-16 15:56:33 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
150 - 10 x weeks = 25 + 15 x weeks
125 = 25 weeks
5 weeks
2007-10-16 15:58:23 · answer #1 · answered by ignoramus 7 · 0⤊ 1⤋
Rocio goes down by 10 per week so if the number off weeks is N then he has 150-10N. Ed goes up by 15 each week so after N weeks he has 25+15N. The two are equal at some time when
150-10N = 25+15N
That can be simplified to 150-25 = 10N+15N
That is 125 = 25N.
Divide both sides by 25 to get N=5 so the answer is 5 weeks.
2007-10-16 16:01:51 · answer #2 · answered by Rich Z 7 · 0⤊ 1⤋
x=number of weeks
Amount of money Rocio has: 150-10x
Amount of money Ed has: 25+15x
When are they equal? Set the two equations equal to each other:
150-10x=25+15x
125=25x
x=5
So after 5 weeks they'll be equal.
2007-10-16 16:00:20 · answer #3 · answered by Anonymous · 0⤊ 0⤋
week 1: 150 - 10 = 140
25 + 15 = 40
week 2: 140 - 10 = 130
40 + 15= 55
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2007-10-16 16:03:05 · answer #4 · answered by old hippie 3 · 0⤊ 0⤋
x = weeks
Rocio's money 150 - 10x
Ed's money 25 + 15x
150 - 10x = 25 + 15x
150 - 25 = 15x + 10x
125 = 25 x
5 = x
2007-10-16 16:01:05 · answer #5 · answered by p00c 2 · 1⤊ 0⤋
150 - x * 10 = 25 + x * 15
or 25x = 125
x = 5
2007-10-16 15:59:00 · answer #6 · answered by ib 4 · 0⤊ 0⤋
w=week
150-10w=25+15w
25w=125
w=5
Will have the same amount of money in 5 weeks
2007-10-16 15:59:53 · answer #7 · answered by Anonymous · 0⤊ 0⤋
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2016-12-18 09:36:03 · answer #8 · answered by ? 3 · 0⤊ 0⤋
1,222,433,354,345,678 weeks
2007-10-16 15:59:18 · answer #9 · answered by Anonymous · 0⤊ 0⤋