algebra
posted by linda .
a chemist has 12% hydrochloric acid+24% hydrochloric. How many of each should be 16 liters of 21%hydrochloric?

12% needed  x
24% needed  16x
solve:
.12x+ .24(16x) = .21(16
times 100
12x + 24(16x) = 21(16)
take over....