Martha has 19 butterflies in her collection. She has twice as many blue butterflies as yellow butterflies. The rest of her butterflies are black. If Martha has 6 blue butterflies, how many black butterflies does she have?
Martha has 6/2=<<6/2=3>>3 yellow butterflies.
Martha has 6+3=<<6+3=9>>9 blue and yellow butterflies.
Martha has 19-9=<<19-9=10>>10 black butterflies.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

A farmer plants his vegetables in neat rows. He has 64 bean seedlings and plants 8 seedlings in a row. He also has 84 pumpkin seeds and plants 7 seeds in a row. Recently, he planted 48 radishes with 6 radishes in a row. If the farmer plants two rows per plant bed, how many plant beds did he have for all his plants?There are 64/8 = <<64/8=8>>8 rows of bean seedlings.
There are 84/7 = <<84/7=12>>12 rows of pumpkin seedlings.
There are 48/6 = <<48/6=8>>8 rows of radishes.
Thus, there are a total of 8 + 12 + 8 = <<8+12+8=28>>28 rows of vegetables.
Therefore, the farmer had 28/2 = <<28/2=14>>14 plant beds.
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It takes Jennifer 20 minutes to groom each of her 2 long hair dachshunds.  If she grooms her dogs every day, how many hours does she spend grooming her dogs in 30 days?She has 2 dogs and it takes 20 minutes to groom just 1 dog so it takes her 2*20 = <<2*20=40>>40 minutes per day to groom 2 dogs
In 30 days, she will have spent 30*40 = <<30*40=1200>>1,200 minutes grooming her dogs
There are 60 minutes in an hour so she spends 1200/60 = <<1200/60=20>>20 hours grooming her dogs
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Now, solve this next question in the style of the above examples:

Martha has 19 butterflies in her collection. She has twice as many blue butterflies as yellow butterflies. The rest of her butterflies are black. If Martha has 6 blue butterflies, how many black butterflies does she have?

### Response:
Martha has 6/2=<<6/2=3>>3 yellow butterflies.
Martha has 6+3=<<6+3=9>>9 blue and yellow butterflies.
Martha has 19-9=<<19-9=10>>10 black butterflies.
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