prompt: Luis needed to buy some socks. He bought 4 pairs of red socks and 6 pairs of blue ones. In total, he spent $42. If the red socks cost $3 each, how much did he pay for each blue pair?
messages.content: Luis needed to buy some socks. He bought 4 pairs of red socks and 6 pairs of blue ones. In total, he spent $42. If the red socks cost $3 each, how much did he pay for each blue pair?
messages.role: user
messages.content: Let B be the cost of the blue socks
  4*3 +6*Y =42
  12 + 6*Y=42
  6*Y =30
  Y = <<5=5>>5
  #### 5
messages.role: assistant