Question: Rachel is an artist. She posts a speed painting video each week on her Instagram account to promote her work. To save time, she paints and records 4 videos at a time. It takes her about 1 hour to set up her painting supplies and her camera. Then she records herself painting for 1 hour per painting. She takes another 1 hour to clean up. Each video takes 1.5 hours to edit and post. How long does it take Rachel to produce a speed painting video?
Answer: Rachel spends 1 + 1 = 2 hours setting up and cleaning up. She paints for 1 hour x 4 paintings = 4 hours. Then she edits 1.5 hours x 4 videos = 6 hours. She spends 2 + 4 + 6 = 12 hours to make 4 videos. So Rachel spends 12 / 4 = 3 hours on each video. The answer is 3.

Question: Tim has to go to the doctor for a sporting injury. He gets an MRI which costs $1200. The doctor needs to examine it for 30 minutes and charges $300 per hour. There is also a $150 fee just for being seen. Insurance covered 80% how much did he pay?
Answer: The doctor charged 300 / 2 = $150. So the total cost was 150 + 150 + 1200 = $1500. The insurance covered 1500 * .8 = $1200. So he paid 1500 - 1200 = $300. The answer is 300.

Question: Lorin has 4 black marbles. Jimmy has 22 yellow marbles. Alex had twice as many black marbles as Lorin and one half as many yellow marbles as Jimmy. How many marbles does Alex have?
Answer: Alex has 2 * 4 = 8 black marbles. Alex has 22 / 2 = 11 yellow marbles. Alex has 8 + 11 = 19 marbles. The answer is 19.

Question: Wyatt has 10 blue envelopes. He has 4 fewer yellow envelopes than blue envelopes. How many envelopes does Wyatt have in all?
Answer:
Wyatt has 10 - 4 = 6 yellow envelopes. The total number of envelopes he has is 10 blue + 6 yellow = 16 envelopes. The answer is 16.