Question 964428
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A=liters of Solution A; B=liters of Solution B
A+B=10
A=10-B Use this to substitute for A
0.10A+0.30B =0.25(10) Substitute for A from above.
0.10(10-B)+0.30B=2.5
1-0.10B+0.30B=2.5 Subtract 1 from each side.
0.20B=1.5 Multiply each side by 5.
B=7.5 ANSWER 1:The chemist should use 7.5 liters of solution B.
A=10-B=10-7.5=2.5 ANSWER 2: The chemist should use 2.5 liters of Solution A.
CHECK:
0.10(A)+0.30(B)=0.25(10)
0.10(2.5)+0.30(7.5)=2.5
0.25+2.25=2.5
2.5=2.5