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?

Snake Coils

Age 7 to 11 Challenge Level:

Imagine a $600$ cm snake that coils into a circle, but he's not going to eat himself.

He is going to coil himself around to make a double circle, then a treble circle and so on until he is coiled round like this rope.

Challenge

Once in a circle how much further will he have to slither to make a double circle of his body? What's this length as a fraction of his total length?

How much further will he have to slither to make three circles of his body?
What's this length as a fraction of his total length?

How much further will he have to slither to make four circles of his body?
What's this length as a fraction of his total length?

How much further will he have to slither to make five circles of his body?
What's this further length as a fraction of his total length?

Final challenge

When the snake has slithered a total of $550$cm along his body length, making smaller and smaller circles of his body, how many circles will there be?