conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: Tonya spent $90.00 on art supplies.  4 canvases cost $40.00 and a mixed set of paints cost 1/2 that much. She also spent $15.00 on an easel, and the rest of the money on paintbrushes. How much money did she spend on paintbrushes?
conversations.from: assistant
conversations.value: The canvases cost $40.00 and she spent half that amount on paint so she spent 40/2 = $20.00 on paint
  She spent $40.00 on canvases, $20.00 on paint and $15.00 on an easel so she spent 40+20+15 = $75.00
  She spent $90.00 total and her other purchases totaled $75.00 so she spent 90-75 = $15.00 on paint brushes