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Lemons and Oranges

Age 7 to 11
Challenge Level

(If you are working with metric measures go here )

On the table there is a pile of oranges and lemons that weighs exactly two and a half pounds.

A pile of oranges and lemons.

The oranges all weigh $4$ oz. The lemons are also all the same weight, which is less than $\frac{3}{4}$ of the weight of an orange.

There are twice as many lemons as oranges in the pile.

How many lemons are there and how much does each one weigh?