Question

For every gallon of water in a swimming pool you’re instructed to add four grams of chlorine. How many grams of chlorine would you add to a pool containing 13 gallons of water

Answer 1

So, we're told that for every gallon of water in the swimming pool there should be four grams of chlorine. In the most simple terms, it's simply we should have a ratio 4grams chlorine:1 gallon of water. We can solve it like any other proportion question as a result, giving us:

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To solve this we want to multiply both sides by 13 gallons to get rid of the gallons and also to isolate the x, so:

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Which means we should add 42 grams of chlorine in a pool containing 13 gallons of watter.