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

### There is a three digit number

There is a three digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?

### In a lake there is a patch of lily pads

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?

### How many fingers are there on 10 hands?

Take a good look at your hands. You have 10 fingers on your hands. How many fingers are there on 10 hands?

### What number do you get

What number do you get when you multiply all of the numbers on a telephone’s number pad?

### There was a girl half my age when I was 12

There was a girl half my age when I was 12, now I am 64, how old is she?