I'm really bad at these problems.
A sunshine paint store has some number of gallons of paint containing 15% of oil-base 75%oil base and 60% oil base the store wants to make 100 gallons of 51% oil base of the sum of three times the numbers of gallons of 15% oil base and 75% oil base is thirty more than the number of gallons of 60%oil base ,then find the numbers of gallons of each types of paint
