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? Let's think step by step and output the final answer after "####".
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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
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?
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