### Jewellery Boxes

Can you find the value of the jewels?

### Average Discovery

Find the missing number if the mean, median and mode are all the same.

### Algebraic Average

The mean of three numbers x, y and z is x. What is the mean of y and z?

# Very Average

##### Age 14 to 16 Short Challenge Level:

In the list below, each number (from $b$ onwards) is the mean of the two numbers before it.

$40$, $a$, $b$, $c$, $d$, $150$

Find the value of $a$

You can find more short problems, arranged by curriculum topic, in our short problems collection.