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zhenek [66]
3 years ago
11

A scientist has two solutions, which she has labeled solution a and solution

Chemistry
1 answer:
klio [65]3 years ago
8 0
Let's make ;
A = ounces solution A
B = ounces solution B


total number of ounces: 
A + B = 120

concentration:
0.65A + 0.80B = 0.7(120)

 Substitute A for 120 - B in the second equation to combine them.

0.65(120 - B) + 0.80B = 84
78 - 0.65B + 0.80B = 84
0.15B = 84 - 78
0.15B = 6
B = 6/0.15
 
B = 40 ounces
Then... A = 120 - 40
A = 60 ounces

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