You have $60 and your sister has $135.you decide to save $5of your allowance each week,while your sister decides to spend her whole allowance plus $10 each week. How long will it be before you hav as much money as your sister?
What would be an equation for that?
2007-10-21 10:20:14 · 4 answers · asked by =] 1 in Science & Mathematics ➔ Mathematics
60 + 5w = 135 - 10w
5w = 75 - 10w
15w = 75
w = 5
5 weeks
2007-10-21 10:29:46 · answer #1 · answered by David D 2 · 0⤊ 0⤋
x= # weeks
assuming the allowance is the same for both siblings
you have 60 and save 5 per week, so 60+5x.
your sister has 135 and spends 10 each week, 135-10x.
I would graph both of these problems and see where they intersect which at x=5 weeks, with both siblings at 85 dollars.
or set both problems equal to one another.
60+5x=135-10x
-75=-15x
x=5 weeks
2007-10-21 17:38:55 · answer #2 · answered by george p 2 · 0⤊ 0⤋
let x be the number of weeks it takes you and your sister to have a same amount of money
you save 5 dollars each week.
then in x weeks, you save +5x dollars
60 + 5x
your sister spend 10 dollors each week
then in x weeks, she spend -10x dollars
135 - 10x
60 + 5x = 135 - 10x
60 + 15x = 135
15x = 75
x = 5 weeks <== answer
2007-10-21 17:32:35 · answer #3 · answered by 7 · 0⤊ 0⤋
60+5x = 135 -10x
15x = 75
x = 5 weeks
2007-10-21 17:30:27 · answer #4 · answered by ironduke8159 7 · 0⤊ 0⤋