conversations.from: human
conversations.value: Solve the math problem: Jar A has 28 marbles. Jar B has 12 more marbles than jar A. Jar C has twice as many marbles as jar B. How many marbles are there altogether?
conversations.from: assistant
conversations.value: Jar B has 28 + 12 = 40 marbles.
  Jar C has 2 x 40 = 80 marbles.
  Therefore, there are 28 + 40 + 80 = 148 marbles altogether.