Mary, Jess, and Christina want to decorate a party room with balloons. Each person inflates balloons at different speeds, and they only have 30 minutes to inflate as many balloons as possible. Mary inflates 10 balloons per minute, Jess inflates 7 balloons per minute and Christina came 15 minutes late and was the slowest one inflating 4 balloons per minute. How many balloons can they inflate before running out of time?
Let's think: Mary will inflate a total of 10 balloons / minute x 30 minutes = 300 balloons. Jess will inflate a total of 7 balloons / minute x 30 minutes = 210 balloons. Christina will inflate a total of 4 balloons / minute x 15 minutes = 60 balloons. Combining all balloons, they made 300 balloons + 210 balloons + 60 balloons = 570 balloons.. The answer is: 570.

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?
Let's think: 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.

Susan earned $600 from babysitting over the summer. She went shopping and spent half of it on clothes. Then she spent half of what was left on books. How much money did she have left?
Let's think: Susan spent 600 / 2 = 300 on clothes. After buying clothes she had 600 - 300 = 300 dollars left. She spent 300 / 2 = 150 dollars on books. She had 300 - 150 = 150 dollars left.. The answer is: 150.

There are six chairs in each row in a church. If there are 20 rows of chairs in the church, and each chair holds five people, calculate the number of people who have to sit in the chairs for the church to be full.
Let's think:
If there are six chairs in each row in the church, the total number of chairs in the church is 6 * 20 = 120. Since each chair holds 5 people, 5 * 120 = 600 people must sit in all of the chairs for the church to be full.. The answer is: 600.