Baseball Caps | NZ Maths

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Toni is selling caps for the baseball club. The picture shows the number of caps that Toni sold during the first three weeks.

Week 1	* * * * * * * * *
Week 2	* * * * * *
Week 3	* * *
Week 4	?

How many hats must Toni sell in week 4 so that the average number of caps that she has sold per week is 7?

Solution