We have a question: Alex makes luxury dresses out of silk. Each dress needs 5 meters of silk and Alex has 600 meters of silk in storage. His friends also want to learn how to make these dresses so Alex gives all 5 of them 20 meters of silk each. He uses the rest to make dresses himself. How many dresses can Alex make?
And an answer: 100
So how you got the answer?
Alex gives his friends a total of 5 friends * 20 meters of silk = 100 meters of silk. This means he has 600 – 100 = 500 meters of silk left in storage. He can therefore make 500 meters of silk / 5 meters of silk per dress = 100 dresses.

We have a question: John hits 70% of his free throws. For every foul he gets 2 shots. He gets fouled 5 times a game. How many free throws does he get if he plays in 80% of the 20 games the team plays?
And an answer: 112
So how you got the answer?
John plays in 20 * .8 = 16 games. That means he gets fouled 16 * 5 = 80 fouls. So he gets 80 * 2 = 160 foul shots. So he makes 160 * .7 = 112 free throws.

We have a question: It takes Roque two hours to walk to work and one hour to ride his bike to work. Roque walks to and from work three times a week and rides his bike to and from work twice a week. How many hours in total does he take to get to and from work a week with walking and biking?
And an answer: 16
So how you got the answer?
Roque takes 2 * 3 = 6 hours a week to walk to work. Roque takes 6 * 2 = 12 hours a week to walk to and from work. Roque takes 1 * 2 = 2 hours a week to bike to work. Roque takes 2 * 2 = 4 hours a week to bike to and from work. In total, Roque takes 12 + 4 = 16 hour a week to go to and from work.