Please answer this math problem correctly.

Henry bought 13 cartons of ice cream and 4 cartons of yogurt. Each carton of ice cream cost $5 and each carton of yogurt cost $1. How much more did Henry spend on ice cream than on yogurt?

Step-by-step explanation:

Price of 13 cartons of ice cream = 13*5 = $65

Price of 4cartons of yogurt = 4*1 = $4

Price spend on ice cream than on yogurt = 65 - 4 = $61

5x+2x=49

7x=49

x=7. 35 apples

i think it might be a but you might want a second opinion