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

With the data below, please fill in the correct answer in the question mark within 20 seconds.

This puzzle is very easy but many people get it wrong.

First calculation:

Shoes + Shoes + Shoes = 30
→ 3 x Shoes = 30
→ Shoes = 10

This implies each pair of Shoes is 10

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:

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