I need help with this word problem

Question

A chemical company makes two brands of antifreeze. The first brand is 70%

 pure antifreeze, and the second brand is 95%

 pure antifreeze. In order to obtain 130

 gallons of a mixture that contains 75%

 pure antifreeze, how many gallons of each brand of antifreeze must be used?

Answer 1

Let x = amount of 70% antifreeze

The 130-x = the amount of 95% antifreeze

Then,

{ 70x + 95(130-x) }/(x + 130 + x) = 75 or 70x + 12,350 - 95x = 9,750

or 25x = 2,600

x = 104 gallons of 70% antifreeze

the 130-x = 26 gallons of 95% antifreeze