Question 1012742
.8x+.3(150-x)= .62(150)
.8x+45-.3x= 93
.5x= 48
x= 96
You need 96 of the 80% solution and 150-96= 54 of the 30%
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Check - let's do a weighted average to prove this:
96/150= .64 (64% of the solution is at 80%)
54/150= .36 (36% of the solution is at 30%) 
(.64*.8)+(.36*.3)= .62 
.62= .62 We have the correct answer
J