Answer: Number of gallons of sulfuric acid is 45 gallons.
Explanation:
Since we have given that
Total number of gallons of solution in a tank = 90 gallons
Percentage of sulfuric acid = 50%
We need to find the number of gallons of sulfuric acid;
Number of gallons of sulfuric acid is give by

Hence, number of gallons of sulfuric acid is 45 gallons.