Answer the following question.
Every 10 seconds, there is a car collision, and every 20 seconds there is a big crash. How many accidents overall will happen in 4 minutes?
Step-by-step reasoning process: 1 minute is 60 seconds, so 4 minutes is 4 * 60 = 240 seconds. During this time there would be 240 / 20 = 12 big crashes. And also 240 / 10 = 24 car collisions. So in total during 4 minutes there would be 12 + 24 = 36 accidents.
The answer is 36.

Answer the following question.
There are 336 books in a library. On Monday, 124 books are taken out. On Tuesday, 22 books are brought back. How many books are there now?
Step-by-step reasoning process: At the end of Monday, there are 336 - 124 = 212 books left. At the end of Tuesday, there are 212 + 22 = 234 books.
The answer is 234.

Answer the following question.
A store sold a certain brand of jeans for $40. They only have few pairs of jeans left so they decided to give 10% discount on every two pairs of jeans bought by a customer at any one time. How much will a customer pay for 3 pairs of jeans?
Step-by-step reasoning process: Two pairs of jeans cost $40 x 2 = $80. A discount of $80 x 10 / 100 = $8 will be given for this. Hence, the cost of two pairs of jeans will now be $80 - $8 = $72. Therefore, the customer will pay $72 + $40 = $112 for the three pairs of jeans.
The answer is 112.

Answer the following question.
Casey wants to decorate her toenails and fingernails. First, she wants to do a base coat on each nail, then a coat of paint and finally a coat of glitter on every nail. It takes 20 minutes to apply each coat and 20 minutes for each coat to dry before applying the next one. Assuming Casey's nails will be done when all coats have been applied and dried, how many minutes will it take her to finish decorating her fingernails and toenails?
Step-by-step reasoning process: Casey wants to paint her 10 toenails + 10 fingernails = 20 nails in total. First she wants to do a base coat which takes 20 minutes to apply + 20 minutes to dry = 40 minutes total for the first coat. It will take the same amount of time to do a coat of paint and let it dry and to do a coat of glitter and let it dry, 40 minutes x 3 different coats = 120 minutes total to paint her toenails and fingernails.
The answer is 120.