Question 640393
let x ml of 10% & 100-x ml of 15% acid soln were mixed to get 100 ml of 12% soln
so 10x/100+15[100-x]/100=12
or 10x+15[100-x]=1200
or -5x=1200-1500=-300
or x=60 ml of 10% & 40 ml of 15% soln were mixed
ans