[Question]: In a parking lot, there are cars and motorcycles. Each car has 5 wheels (including one spare) and each motorcycle has 2 wheels. There are 19 cars in the parking lot. Altogether all vehicles have 117 wheels. How many motorcycles are at the parking lot?
[Answer]: There are 19 cars at the lot, so there are 5 * 19 = 95 wheels of cars. So there are 117 - 95 = 22 wheels of motorcycles in the parking lot. Each motorcycle has 2 wheels, so that leaves us with 22 / 2 = 11 motorcycles in the parking lot.
So the answer is 11.

[Question]: Jar A has 28 marbles. Jar B has 12 more marbles than jar A. Jar C has twice as many marbles as jar B. How many marbles are there altogether?
[Answer]: Jar B has 28 + 12 = 40 marbles. Jar C has 2 x 40 = 80 marbles. Therefore, there are 28 + 40 + 80 = 148 marbles altogether.
So the answer is 148.

[Question]: Sasha made 30 chocolate muffins for her school bake sale fundraiser. Melissa made 4 times as many muffins as Sasha, and Tiffany made half of Sasha and Melissa's total number of muffins. If one muffin sold for $4, how much money did Sasha, Melissa, and Tiffany contribute to the fundraiser?
[Answer]:
Melissa made 30 x 4 = 120 muffins. Together, Melissa and Sasha made 30 + 120 = 150 muffins. Tiffany made 150 / 2 = 75 muffins. Altogether, they made 150 + 75 = 225 muffins. They contributed 225 x $4 = $900 to the fundraiser.
So the answer is 900.