Plz explain to me how to do this problem?

A red river is 4000 miles long the yellow river is 98.8% length of the amazon.
What is the length of red r.

4000 miles

To find the length of the red river, we first need to determine the length of the Amazon River. Given that the yellow river is 98.8% the length of the Amazon, we can calculate the length of the Amazon using the following steps:

Step 1: Calculate the length of the yellow river:
Since we know that the red river is 4000 miles long, and the yellow river is 98.8% the length of the Amazon, we can set up the following equation:
Length of yellow river = 0.988 * Length of Amazon River

Step 2: Solve for the length of the Amazon River:
To find the length of the Amazon river, we need to divide the length of the yellow river by 0.988:
Length of Amazon River = Length of yellow river / 0.988

Step 3: Calculate the length of the red river:
Now that we have the length of the Amazon River, we can substitute it in the original equation to find the length of the red river:
Length of red river = 4000 miles / (Length of Amazon River / 0.988)

By following these steps, you can calculate the length of the red river.