This is from Section 1 Question 5

5. At a certain diner, a hamburger and coleslaw cost $3.59, and a hamburger and french fries cost $4.40. If french fries cost twice as much as coleslaw, how much do french fries cost?

(A) $0.30

(B) $0.45

(C) $0.60

(D) $0.75

(E) $0.90

The answer is in the answer sheet is (E). I tried back solving and the only answer that came was close to matching the description was E.

But when i assigned variables such as X (hamburger) Y (Coleslaw) and Z (French Fries) I got the following Equations:

X + Y = 3.59

X + Z = 4.40

Z = 2Y (FRENCH FRIES twice as expensive as COLESLAW)

Solving the above equations i get Y = 0.81 and Z = 1.62, and 1.62 is not even in the options for the cost of french fries..

I dont know know if i have done something wrong in forming the equations. Could someone guide me plzz.