There are 20 pens in a package. ten of the pens are black, 8 are blue, and the rest are red. which ratio represents the number of red pens to black pens?

 The ratio represents the number of red pens to black pens = 1:5.

Step-by-step explanation:

Given : Total pens in package = 20

Number of black pens = 10

Number of blue pens = 8

Number of red pens =   (Total pens in package) - (Number of black pens ) -(Number of blue pens )

= 20-10-8

=2

Now , the ratio represents the number of red pens to black pens =

Number of red pens : Number of black pens

=2 : 10

= 1 :5  [Dividing both sides by 2]

Thus , the ratio represents the number of red pens to black pens = 1:5.

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