a solution of 73% pesticide is to be mixed with a solution of 29% pesticide to form 88 liters of a 53% solution. How many liters of the 73% solution must be used?

Solution:

x liters of the 73% solution must be used

So

73%x+29%(88-x)=53%*88

x=48

So 48 liters of the 73% solution must be used