You would divide 20 by 8.
20/8=2.5
That would give a decimal. They can cut it in half.
If you wanted it without decimals it would be 2 so each kid would get 2 lollies. So 16 out of the 20 lollies have been spent. 20-16=4, so, 4 lollies are left.
a. Each kid would get 2 lollies.
b. Yes, there will be 4 lollies left if each kid gets 2.