[Question]: In a class of 300 students, the number of smoking teens is 40% of the class. In a year, 70% of the smoking students are hospitalized from smoking-related complications. Calculate the total number of smoking students from the class who have not been hospitalized from smoking-related complications.
[Answer]: If the class has 300 students, there are 40 / 100 * 300 = 120 smoking students. In a year, 70% of the smoking students are hospitalized from smoking - related complications, a total of 70 / 100 * 120 = 84 students. The number of smoking students who've not been hospitalized from smoking - related complications is 120 - 84 = 36.
So the answer is 36.

[Question]: Mr Julien's store has 400 marbles remaining after the previous day's sales. Twenty customers came into the store, and each bought 15 marbles. How many marbles remain in the store?
[Answer]: If each of the 20 customers bought 15 marbles, then they bought 20 * 15 = 300 marbles in total from Mr Julien's store. The number of marbles remaining in the store is 400 - 300 = 100 marbles.
So the answer is 100.

[Question]: Nicky went to the DMV. He spent 20 minutes waiting to take a number, and quadruple that amount of time plus 14 minutes waiting for his number to be called. How long did he wait total?
[Answer]:
First find how long Nicky spent waiting for his number to be called: 4 * 20 minutes + 14 minutes = 94 minutes. Then add the time he spent waiting to take a number: 94 + 20 = 114 minutes.
So the answer is 114.