Human: Bob and Johnny have a leaf raking business. They charge $4 for each bag of leaves they rake. On Monday they raked 5 bags of leaves. On Tuesday they raked 3 bags of leaves. On Wednesday, they counted their money and found they had $68 for all three days. How many bags of leaves did they rake on Wednesday? Assistant: 
How many bags of leaves did they rake on Monday and Tuesday? ** Combining Monday and Tuesday, they raked 5 + 3 = <<5+3=8>>8 bags of leaves.
How much did they earn on Monday and Tuesday? ** They earned 8 * $4 = $<<8*4=32>>32 for the first two days.
How much did they earn on Wednesday? ** O for Wednesday's work they earned $68 - $32 = $<<68-32=36>>36.
How many bags of leaves did they rake on Wednesday? ** Thus, they raked $36 / $4 = <<36/4=9>>9 bags of leaves on Wednesday.
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