Answer:
$ 77.88
Step-by-step explanation:
1 Gallon = 4 Quarts
3 Gallons = 3*4=12 Quarts
thus (19.47/3)*12 =$ 77.88 (we know 3 quarts cost $19.47, so divide by 3 and multiply by 12 gives the result.
All you have to do is move your decimal point over eight places to the right and then subtract that from the first number and you have your answer.
With 5lbs of sugar syrup to get a 25% syrup you would need to add 15lbs of water