Joe goes camping with his dad on a Friday. Joe's dad has 21 marshmallows, and Joe has four times as much marshmallows as his dad. If Joe’s dad roasts a third of his marshmallows, and Joe roasts half of his marshmallows, how many marshmallows did they roast in total? Let's think step by step and output the final answer after "####".
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Joe’s dad roasts 21/3 = <<21/3=7>>7 of his marshmallows.
Joe has 21*4 = <<21*4=84>>84 marshmallows.
Joe roasts 84/2 = <<84/2=42>>42 of his marshmallows.
Joe and his dad roasted 7+42 = <<7+42=49>>49 marshmallows in total.
#### 49
Joe goes camping with his dad on a Friday. Joe's dad has 21 marshmallows, and Joe has four times as much marshmallows as his dad. If Joe’s dad roasts a third of his marshmallows, and Joe roasts half of his marshmallows, how many marshmallows did they roast in total?
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