Mrs. Kindred bought 19 apples of 2 different varieties to make a pie. The total cost of apples was $5.10. Granny Smith apples cost $0.25 each and Gala apples cost $0.30 each. How many of each type did Mrs. Kindred buy? Use the elimination method.

Question

Mrs. Kindred bought 19 apples of 2 different varieties to make a pie. The total cost of apples was $5.10. Granny Smith apples cost $0.25 each and Gala apples cost $0.30 each. How many of each type did Mrs. Kindred buy? Use the elimination method. 
I just want someone to help explain how to lay out this equation from the story problem.

oobleck · Answer

let there be s Smith apples g = Gala apples Then you have been told that s+g = 19 25s + 30g = 510 Now solve for s and g