Question 770077
A 30% solution is prepared by mixing a 20% and 45% solution. How many litres of each must be used to produce 60 litres of the 30% solution?
***
let x=amt of 20% solution to be used
60-x=amt of 45% solution to be used
..
20%x+45%(60-x)=60%*30
0.20x+27-0.45x=18
0.25x=9
x=36
60-x=24
amt of 20% solution to be used=36 litres
amt of 45% solution to be used=24 litres