[Question]: Jack bought 55 apples. He wants to give 10 to his father and then equally share the remaining apples between him and his 4 friends. How many apples will each of them get?
[Answer]: The number of apples remaining after Jack gave his father 10 is 55 - 10 = 45. The share each one of his friends including him will get is 45 / 5 = 9.
So the answer is 9.

[Question]: Three-quarters of the oil from a 4000-liter tank (that was initially full) was poured into a 20000-liter capacity tanker that already had 3000 liters of oil. How many more liters of oil would be needed to make the large tanker half-full?
[Answer]: Three - quarters of oil from the initially full 4000 - liter tank would be 4000 * (3 / 4) = 3000 liters. In addition to the 3000 liters that were already in the large tanker, there are 3000 + 3000 = 6000 liters in it now. The tanker would be filled to half capacity by (1 / 2) * 20000 = 10000 liters of oil. There are 10000 - 6000 = 4000 liters left to reach half capacity.
So the answer is 4000.

[Question]: James spends 3 hours vacuuming and 3 times as long on the rest of his chores. How long does he spend on his chores?
[Answer]:
He spends 3 * 3 = 9 hours on his other chores. So he spends 3 + 9 = 12 hours on chores.
So the answer is 12.