Math Riddles

I have 10 red socks and 10 blue socks in a drawer. How many socks must I take out to ensure that I have at least one matching pair? One how many to ensure I have at least a pair of red and a pair of blue?

I have five and take away two, yet I am left with four. How is this possible?

If 1/2 of 5 is 3, then what is 1/3 of 10?

If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?

If 3 salesmen can sell three cars in seven minutes, how many cars can six salesmen sell in seventy minutes?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If half of 5 were 3, what would one-third of 10 be?

If it is two hours later, then it will take half as much time till it’s midnight as it would be if it were an hour later. What time is it?

If it takes four rat catchers four minutes to kill four rats, how many rat catchers would be needed to catch 50 rats in 50 minutes?

If Mr. Flynn is 90 centimeters plus half his height, how tall is he?

If the zookeeper had 100 pairs of animals in her zoo and if two pairs of babies are born for each and every one of the original animals, and then sadly 23 animal don’t survive, how many animals do you have left in total?

If two hours ago, it was as long after one o’clock in the afternoon as it was before one o’clock in the morning, what time would it be now?

If two is a company and three is a crowd, what are four and five?

If two’s company, and three’s a crowd, what are four and five?