There are 20 red and blue pens in abox. There are 3times as many blue pens as red pens? How many red pens are there? How many blue pens are there?

my answer is red 20 the blue is 60.

Lidia, Miki -- Please use the same name for your posts.

20 + 60 = 80

But your problem states there only 20 pens in the box.

Please try again.

Think of it this way:

You really have 4 groups of pens in that box of 20 pens. One group is red and the other 3 groups are blue.

Divide 20 by 4. What do you get?

That answer is the number of red pens.
Three times that answer is the number of blue pens.

red is 5, blue is 15 am i right, thank you....

Yay! You've got it! And thanks to Writeacher for helping you!

To find the number of red pens and blue pens, we can set up a system of equations based on the given information.

Let's say the number of red pens is "r" and the number of blue pens is "b".

From the information given, we know that there are 20 pens in total. So we can write the first equation as:
r + b = 20 ----(Equation 1)

We are also told that there are 3 times as many blue pens as red pens. So, we can write the second equation as:
b = 3r ----(Equation 2)

To find the number of red pens, we need to solve this system of equations.

Substituting equation 2 into equation 1, we have:
r + 3r = 20
4r = 20
r = 5

Now that we know the value of "r" (number of red pens), we can substitute it back into equation 2 to find the number of blue pens:
b = 3r
b = 3(5)
b = 15

Therefore, there are 5 red pens and 15 blue pens in the box.