There are 5 red pens in Roger's desk drawer. There are 5 more black pens than red pens. There are also 4 more blue pens than red pens. How many pens are there in all?
Question
There are 5 red pens in Roger's desk drawer. There are 5 more black pens than red pens. There are also 4 more blue pens than red pens. How many pens are there in all?
Solution
First, let's identify the number of each color of pens:
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Red pens: We know there are 5 red pens.
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Black pens: We know there are 5 more black pens than red pens. So, 5 (red pens) + 5 (more) = 10 black pens.
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Blue pens: We know there are 4 more blue pens than red pens. So, 5 (red pens) + 4 (more) = 9 blue pens.
Now, let's add up all the pens:
5 (red pens) + 10 (black pens) + 9 (blue pens) = 24 pens
So, there are 24 pens in all.
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