First find how many ml of water Jason needs for 1 gram of charcoal: 30 ml / 2 grams = <<30/2=15>>15 ml/g

Then divide the amount of water Jason uses by the amount of water per gram of charcoal to find how much charcoal he uses: 900 ml / 15 ml/g = <<900/15=60>>60 g

# Answer

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Question:
Jason is mixing a batch of black paint. He needs to add 2 grams of charcoal for every 30 ml of water. If he adds 900 ml of water, how much charcoal does he add?
Answer:
Let's think step by step.

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Jason is mixing a batch of black paint. He needs to add 2 grams of charcoal for every 30 ml of water. If he adds 900 ml of water, how much charcoal does he add?
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