A container holds 13 pencils, 5 black pens, and 3 blue pens. What is the ratio of pens to all writing tools?
5 black pens + 3 blue pens = 8 pens
8 / ( 13 + 5 + 3 ) = 8 / 21
nothing
To find the ratio of pens to all writing tools, we need to determine the total number of pens and writing tools.
The total number of pens is computed by summing the number of black and blue pens: 5 + 3 = 8 pens.
To calculate the total number of writing tools, we add the number of pencils to the total number of pens: 13 + 8 = 21 writing tools.
Thus, the ratio of pens to all writing tools is 8 pens to 21 writing tools, or simply 8:21.
To find the ratio of pens to all writing tools, we need to determine the total number of pens and the total number of writing tools in the container.
First, let's add up the number of pens. There are 5 black pens and 3 blue pens, so the total number of pens is 5 + 3 = 8.
Next, let's calculate the total number of writing tools in the container. This includes the pens and the pencils. The container holds 13 pencils, so the total number of writing tools is 13 (pencils) + 8 (pens) = 21.
Now, we can determine the ratio of pens to all writing tools by dividing the number of pens by the total number of writing tools: 8 (pens) / 21 (writing tools) = 8/21.
Therefore, the ratio of pens to all writing tools is 8/21.