conversations.from: human
conversations.value: Ali, Nada, and John have a total of $67 in their wallets. Ali has $5 less than Nada and John has 4 times more than Nada. How much money does John have?
  Find the solution.
conversations.from: assistant
conversations.value: Let's say that N is what Nada has, J is what John has, and A is what Ali has. We know that A = N - 5 and J = 4N.
  We also know that: N + A + J = $67
  We can substitute the equations from step 1 into the equations from step 2 to get: N + 4N + (N-5) = $67
  Combining like terms gets us 6N - 5 = $67
  So, N=($67+5)/6 = $12
  Substituting $12 back into the equation J = 4 N, we find John has 4 x 12 = $48