Question 36886
15X+40(60-X)=1900 OR 15X+2400-40X=1900 OR -25X=-500 OR X=500/25 OR X=20 THUS IT RAINES 20 HOURS @ 15ML & (60-20)=40 HOURS @ 40ML
PROOF 15*20+40*40=1900 OR 300+1600=1900 OR 1900=1900