conversations.from: human
conversations.value: Mara and Riley went to a carnival, Mara rode the bumper car two times, Riley rode the space shuttle four times, and they both rode the Ferris wheel three times. If a ticket for a bumper car cost $2, a ticket for a space shuttle cost $4, and a ticket for a Ferris wheel cost $5, how much money did they spend?
conversations.from: assistant
conversations.value: Mara spent $2 x 2 = $4 for riding the bumper car two times.
  Riley spent $4 x 4 = $16 for riding the space shuttle 4 times.
  They spent $5 x 3 = $15 each riding the Ferris wheel 3 times.
  So, they spent a total of $15 x 2= $30 riding the Ferris wheel.
  Therefore the total amount they spent at the carnival is $4 + $16 + $30 = $50.