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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?


Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

Why do this problem?

This problem is a good challenge for those children who are competent with calculating using fractions and decimals.

Key questions

What are you trying to find out?
What do the two weights weigh altogether?
If you took the quarter pie off the scales, what could you do to the whole pie to make the scales balance?