Final answer:
Chang has ridden 75% of the 76-mile bike course, which is calculated by dividing the distance ridden (57 miles) by the total distance and multiplying by 100.
Step-by-step explanation:
To calculate what percentage of the bike course Chang has ridden, you divide the distance he has ridden by the total distance of the course, and then multiply that result by 100 to get a percentage. The calculation would be as follows:
- Divide the distance ridden by the total distance: 57 miles / 76 miles.
- Calculate the quotient: 0.75 (when rounded to two decimal places).
- Multiply the quotient by 100 to get a percentage: 0.75 x 100 = 75%.
Therefore, Chang has ridden 75% of the course.