Bruce wants to make 50 ml of an alcohol solution with a 12% concentration. He has a 10% alcohol solution and a 15% alcohol solution.
Which equation can Bruce use to determine how much of the 10% alcohol solution he should use?

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We need 50 ml of a 12% alcohol solution.

We have 10% and 15% alcohol solutions and we want 50 ml at 12%

We set up 2 equations (x is the volume of 10% y is the volume of 15%)

a) x + y = 50

b) .1x + .15y = 6.0 (which is 50 ml at 12% or .12 * 50)

multiplying equation "a" by -.1 then add it to "b"

a) -.1x -.1y = -5

b) .1x +.15y = 6.0

.05y = 1

y = 20 ml of 15% and therefore x would equal 30 ml of 10%

Step-by-step explanation:

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points

step-by-step explanation:

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