There are 50 - 40 = <<50-40=10>>10 cartons of canned juice that are left to be loaded on the truck.

This is equal to 10 x 20 = <<10*20=200>>200 cans of juice.

# Answer

200
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A supplier is packing cartons of canned juice. Each carton has 20 cans of juice. Out of the 50 cartons that have been packed, only 40 cartons have been loaded on a truck. How many cans of juice are left to be loaded on the truck?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
200
A supplier is packing cartons of canned juice. Each carton has 20 cans of juice. Out of the 50 cartons that have been packed, only 40 cartons have been loaded on a truck. How many cans of juice are left to be loaded on the truck?
train