there are 35 pens in a box 15 of the pens are green the rest of them are red write down the ratio of the number of green pens to the number of red pens give your ratio in its simplest form

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First, you have 35 total pens in the box. 15 are green. to find how many red pens you need to find the difference between 35 and 15 to get how many red pens there are. (35-15= 20) Therefore, there are 20 red pens. The ratio needs to be green pens to red pens. So, there is 15 green and 20 red ( 15/20 or 15:20) Simplify that by 5 and you get 3/4 or 3:4. 

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