Question

Chau is riding on a bike course that is 80 miles long. So far, he has ridden 64 miles of the course. What percentage of the course has Chau ridden so far?

Answer 1

Let the percentage be x%,

then,

x% of 80 = 64
$\frac{x}{100} \times 80 = 64 \\ \frac{x}{10} \times 8 = 64 \\ \frac{x}{10} = \frac{64}{8} \\ x = 8 \times 10 = 80 \%$

He has ridden 80% of the total bike course.

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