Algebra help.?

1 ⤊

How many liters of a 15% cleaning solution must be mixed with 3 liters of a 60% cleaning solution in order to obtain a 45% cleaning solution?

2007-07-04 08:47:40 · 4 answers · asked by Bob 1 in Science & Mathematics ➔ Mathematics

4 answers

15x + 3*60 = 45(3+x)
15x + 180 = 135 + 45x
45 = 30x
x = 1.5 liters

2007-07-04 08:57:38 · answer #1 · answered by Steve A 7 · 1⤊ 0⤋

Let y be the total number of litres of 45% cleaning solution obtained.

(y-3)(15) + 3(60) = 45y
15y - 45 +180 = 45y
30y = 135
y = 9/2
= 4 1/2
4 1/2 - 3 = 1 1/2

2007-07-04 16:02:05 · answer #2 · answered by Anonymous · 0⤊ 0⤋

(X)(0.15) + (3)(0.6) = (3+X)(0.45)...X=1.5 liters

2007-07-04 15:57:45 · answer #3 · answered by ry0534 6 · 0⤊ 0⤋

0.75L=75dL

2007-07-04 19:24:41 · answer #4 · answered by haien12895 1 · 0⤊ 0⤋