The total cost of a sandwich, glass of milk, and an apple is $3.50. the milk costs one and a half times as much as the apple. the sandwich cost $1.40 more than the apple. what is the price of each?

The total cost of a sandwich, a glass of milk, and an apple is $2.35 What was the price of each, if the sandwich cost twice as much as the milk and the apple cost 90 cents less than the sandwich? 

s=cost of the sandwich.
m=s/2
a=s-.9
s + s/2 + s-.9 = 2.35
2s+s+2s-1.8=4.7 Multiply each side by 2.

5s-1.8=4.7
5s=6.5
s=$1.30
m=$.65
a=$.40

You have to give us options