Simple but easy to mistake riddle, can you solve it in 20 seconds?

Second calculation:

Boy + Boy + Shoes = 20

Since the Shoes are 10, we have:

Boy + Boy + 10 = 20
→ 2 x Boy + 10 = 20
→ 2 x Boy = 10
→ Boy = 5

This implies Boy is 10

Third calculation:

Burgers + Burgers + Boy = 13

We know the boy is 5 and we have 4 burgers, so:

2 x Burger + 2 x Burger + 5 = 13
→ 4 x Burger = 8
→ Burger = 2

This implies Burger is 10

Final calculation:

Shoe + Boy with 2 burgers and shoes + Burger = ?
→ Shoes/2 + (Boy + 2 x Burger + Shoes) x Burger = ?
→ 10/2 + (5 + 2 x 2 + 10) x 2 = ?
→ 5 + (5 + 4 + 10) x 2 = ?
→ ? = 43

Answer: 43