A candy bar and a piece of bubble gum together cost 1.50. The candy bar costs a dollar more than the bubble gum. How much does the piece of bubble gum cost, in cents?
C==Candy bar, B==Bubble gum
C + B ==1.50
C ==B + 1, solve for C, B
B + 1 + B==1.50
2B ==1.50 - 1 ==0.50
B ==0.50 / 2 ==0.25 cents - cost of bubble gum
C ==0.25 + 1 ==$1.25 cost of candy bar.
