Come up with a question and reasoning that would justify [11] as the answer.
The question is: Adam went to a shop to buy some food for his journey. He bought 3 sandwiches, for $3 each, and a bottle of water for $2. How much did Adam pay for all the shopping?
Reasoning: Adam bought 3 sandwiches, so he paid 3 * 3 = $9 for them. In total Adam bought products for 2 + 9 = $11.

Come up with a question and reasoning that would justify [5] as the answer.
The question is: Tom split 2 apples into 8 slices each. Tom gave 3/8ths of the apple slices to his friend Jerry, then ate half of the remaining slices. How many apple slices does Tom have left?
Reasoning: 2 apples cut into 8 slices each is 2 * 8 = 16 slices. 2 / 8ths of the apple slices is 16 * 3 / 8 = 6 slices. Tom had 16 - 6 = 10 slices. Tom then ate half the slices so he has 10 / 2 = 5 slices.

Come up with a question and reasoning that would justify [81] as the answer.
The question is: If a solver flips a coin 211 times and gets a head on 65 of the flips, how many more tails than heads did he get?
Reasoning: If the solver got a head in 65 of the 211 flips, he got 211 - 65 = 146 tails. The number of tails than he got more than head is 146 - 65 = 81.