What is a ratio?
A ratio has two or more numbers that symbolize relation to each other. Ratios are used to compare the numbers, and you can compare them using division.
What are units?
A unit can be used for measurement, and is commonly found in mathematics to describe length, size, etc.
First, we would need to know the ratio of yards to feet.
1 yard = 3 feet
Now that we know this, we can take the 180 yards and multiply that by the number of feet in each yard.
850 × 3 = 2550
This means that Rachel hiked 2550 feet.
Now that we have the same units, we can take the amount Rachel hiked, and subtract that by the amount Benny hiked.
2550 - 2145 = 405
Therefore, Rachel hiked 405 more feet than Benny.