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A row of tiny red beads is placed at the beginning and at the end of a 20-centimeter bookmark
A row of the same beads is also placed every 4 millimeters along the bookmark
How many rows of the beads are used on the bookmark?
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Answer:

There are 50 beads on the bookmark.

Step-by-step explanation:

To know the number of rows of the beads are used on the bookmark, we just need to divide.

Notice that the bookmark is 20 centimeters long, and each bead is 4 milimiters. In order to divide, we need to transform centimeters to millimeters.

We know that 1 centimeter is 10 millimeters, that means 20 centimeters is 200 millimeters.

Then, the division is

[tex]\frac{200mm}{4mm} =50[/tex]

Therefore, there are 50 beads on the bookmark.

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