### Not a Polite Question

When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...

### Whole Numbers Only

Can you work out how many of each kind of pencil this student bought?

# Six Times Five

##### Age 11 to 14Challenge Level

How many six-digit numbers are there which DO NOT contain a $5$?