21 blocks, because if he uses 38 you subtract 17 and you get 21
Answer:
7 year old boys: 45-53 inches
7 year old girls: 45-52 inches
<h3>your answer is 20: 1 2 </h3>
<h2>hope it's helpful for you ✌️❤️ ✌️✌️✌️✌️</h2>
What's the name of the book? I will help but need the book's name.