Hi

Let represent How many gallons of a 25% chemical solution must be added

Mixing the 25% and 50% to get 30% solution:

***   |Solve for x

      .20*60gal/.05 = x = 240gal, the gallons of 25% solution to add

 CHECKING our answer***

 60gal + 30gal = .30*300gal = 90gal

Wish You the Best in your Studies.

 

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