Pizza Portions

My friends and I love pizza. Can you help us share these pizzas equally?

Pies

Grandma found her pie balanced on the scale with two weights and a quarter of a pie. So how heavy was each pie?

Red Balloons, Blue Balloons

Katie and Will have some balloons. Will's balloon burst at exactly the same size as Katie's at the beginning of a puff. How many puffs had Will done before his balloon burst?

Orange Drink

Stage: 2 Challenge Level:

This is a $750$ ml bottle of concentrated orange squash.

It is enough to make fifteen $250$ ml glasses of diluted orange drink.

How much water is needed to make $10$ litres of this drink?