Hello, I don't know what type of question this is but the homework sheet says 'Parallel questions: Word problems Addition and subtraction'.

The question I'm stuck on is 'There are 70 pupils in total and three clubs. Robotics, Art, and Science. Science has 7 more than art. Robotics has 10 more than science. How many are in the robotics club?'

I understand that art has the fewest, then science, then robotics. Can someone please help, what type of calculation do I do? Is it trial and error? Many thanks.

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