A fire engine travels eight miles to a fire at a speed of 32 mph.

Its tank holds 500 gallons of water but it has been leaking at a rate of 20 gallons per hour throughout its journey.

How many gallons of water will the fire engine have available for putting out the fire?

What letter should appear next in this sequence?

C   E   H   J   M   O   R   T   ?

Assume you are using a basic calculator and press the numbers in the order shown, replacing each question mark with a mathematical sign.

Plus, minus, multiply and divide can each be used once only.

What is the lowest number you can possibly score?

6  ?  2   ?  3  ?  5  ?  6  =