Hugo is given a rectangular piece of thin cardboard, 16 ?? by 10 ??. He decides to design a tray with it. He removes from each corner the shaded squares of side ? ??, as shown in the following diagram   The remainder of the cardboard is folded up to form the tray as shown in the following diagram. Write down, in terms of ? , the length and the width of the tray.   State whether ? can have a value of 5. Give a reason for your answer.

Hugo is given a rectangular piece of thin cardboard, 16 ?? by 10 ??. He decides to design a tray
with it.
He removes from each corner the shaded squares of side ? ??, as shown in the following diagram

The remainder of the cardboard is folded up to form the tray as shown in the following diagram.

Write down, in terms of ? , the length and the width of the tray.

State whether ? can have a value of 5. Give a reason for your answer.