Question

To the nearest​ millimeter, a cell phone is 129 mm long and 75 mm wide. What is the ratio of the width to the​ length?

Answer 1

All ratios can be taken as fractions. So, to simplify it, you can take it as 75/129 as they asked for width to length.
Simplify it. After simplification, you get 25/43.
So your ratio will be 25:43.

In short, the simplified ratio is 25:43

Hopefully that is the answer and you found this helpful :)