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Well Read

Stage: 3 and 4 Short Challenge Level: Challenge Level:2 Challenge Level:2

In Miss Quaffley's class, one third of the pupils bring a teddy bear to school. Last term, each boy took $12$ books out of the library, each girl took $17$ books and each teddy bear took $9$ books.

In total $305$ books were taken out. How many girls are there in Miss Quaffley's class?

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

This problem is taken from the UKMT Mathematical Challenges.
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