Ben bought 12 similar pens. Charlie bought 4 similar pens and 9 markers. Each marker cost $1.20. Charlie paid $13.20 less than Ben. How much did each pen cost?

Candice bought 3 shirts. Each shirt cost the same ammount and was discounted by $3.66. Candice paid a total of $62.31 before tax. How much did each shirt cost before the discount?

What value of x will make the triangles similar by the SSS similarity theorem?

Are two equilateral triangles always similar? Are two isosceles triangles always similar?