Glenn raced his motorcycle 30 times last season. He finished first 12 times, second 5 times, and crashed in 9 races. What percent of the races did he finish second ? Set up as a proportion and solve

5/(30+12+5)=?

E3

To find the percentage of races Glenn finished second, we need to set up a proportion comparing the number of races he finished second to the total number of races.

Let's represent the number of races Glenn finished second as "x" and the total number of races as 30.

We can set up the following proportion:

\(\frac{x}{30} = \frac{5}{100}\)

To solve for "x," we can cross-multiply:

\(100x = 5 \times 30\)

\(100x = 150\)

To isolate "x," we divide both sides of the equation by 100:

\(x = \frac{150}{100}\)

\(x = 1.5\)

Since we can't have a fraction of a race, we need to round the value. In this case, Glenn finished second in 2 races out of 30.

To find the percentage, we divide the number of races Glenn finished second (2) by the total number of races (30) and multiply by 100:

\(\frac{2}{30} \times 100 = \frac{1}{15} \times 100 = 6.67\)

Therefore, Glenn finished second in approximately 6.67% of the races.