Hilary is collecting her toenails in a jar to gross out her sister. She can fit 100 toenails in the jar, unless they are from her two big toes, which are twice as big as the rest. She has already filled it with 20 big toenails and 40 regular toenails. How many regular toenails can she fit into the remainder of the jar?
Let's think: The 20 big toenails take up as much space as 40 regular toenails because 20 x 2 = 40. She has filled up 80 toenails worth because 40 + 40 = 80. She can fit 20 regular toenails in the jar because 100 - 80 = 20.. The answer is: 20.

Corna wants to buy a shirt. The store buys the shirt for $20, but charges 30% for profit. However, the shirt is on sale for 50% off the selling price. What is the price now?
Let's think: First find how much the store makes in profit: $20 * 0.30 = $6 for profit. Then find the regular selling price: $20 + $6 = $26 total price. Then multiply the regular price by the discount to get $26 * 0.50 = $13 for the final price.. The answer is: 13.

On a trip to visit the local museum, Mr. Gordon has taken 2/5 times more girls than boys. If their bus has a driver and an assistant, and the total number of boys on the trip is 50, calculate the total number of people on the bus considering the teacher also drives together with the students on the bus.
Let's think: The number of girls was 2 / 5 times more than the boys, which is 2 / 5 * 50 = 20 more girls. The total number of girls on the trip is 50 + 20 = 70. Together with the driver, the assistant driver, and the teacher, there were 70 + 50 + 3 = 123 people on the bus.. The answer is: 123.

There were 180 apples in each crate. 12 such crates of apples were delivered to a factory. 160 apples were rotten and had to be thrown away. The remaining apples were packed into boxes of 20 apples each. How many boxes of apples were there?
Let's think:
The total number of apples delivered was: 180 apples x 12 crates = 2160 apples. So, the number of remaining apples after throwing away the rotten ones was: 2160 apples – 160 apples = 2000 apples. And now, we can find the total number of boxes of apples by dividing the remaining number of apples by the number of apples per box: 2000 apples / 20 apples / box = 100 boxes of apples.. The answer is: 100.