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Knitting Scarves

Stage: 3 Short Challenge Level: Challenge Level:1
See all short problems arranged by curriculum topic in the short problems collection

A knitted scarf uses three balls of wool. I start the day with $b$ balls of wool and knit $s$ scarves. How many balls of wool do I have at the end of the day?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

 

 

This problem is taken from the UKMT Mathematical Challenges.