Answer this question:If Katherine has 4 apples and 3 times as many pears in her fridge, how many bananas does she have if she has a total of 21 pieces of fruit?
Katherine has a total of 3 * 4 apples = 12 pears. She therefore had 4 apples + 12 pears = 16 apples and pears. We know she has 21 total pieces of fruit, so this means she must have 21 total - 16 = 5 bananas.
The answer is 5.

Answer this question:Samantha bought a crate of 30 eggs for $5. If she decides to sell each egg for 20 cents, how many eggs will she have left by the time she recovers her capital from the sales?
There are 100 cents in each $1 so $5 gives 5 * 100 cents = 500 cents. To recover her capital of 500 cents from a selling price of 20 cents per egg she has to sell 500 / 20 = 25 eggs. There were 30 eggs in the crate to start with so she will have 30 - 25 = 5 eggs left.
The answer is 5.

Answer this question:Darma can eat 20 peanuts in 15 seconds. At this same rate, how many peanuts could she eat in 6 minutes?
There are 60 * 6 = 360 seconds in 6 minutes. Then there are 360 / 15 = 24 sets of 15 seconds. So, Darma could eat 24 x 20 = 480 peanuts.
The answer is 480.

Answer this question:Kathleen receives a weekly allowance for completing all of her chores. During middle school, her allowance was $2 more than $8 but during her senior year, her allowance was $5 more than twice her middle school allowance. What is the percentage increase in Kathleen's weekly allowance?
Kathleen's allowance in middle school was $8 + $2 = $10. Twice her middle school allowance is $10 x 2 = $20. So, Kathleen's senior year allowance is $20 + $5 = $25. Her allowance increased by $25 - $10 = $15. Kathleen's percent increase in her weekly allowance is $15 / $10 x 100% = 150%.
The answer is 150.