By buying two shirts, Charlie will save $40 x \( \frac{50}{100} \) = \( \frac{$40 x 50}{100} \) = \( \frac{$2000}{100} \) = $20.00 on the second shirt.

So, his total cost will be
$40.00 + ($40.00 - $20.00)
$40.00 + $20.00
$60.00

To add these distances, they must share the same unit so first you need to first convert the swim distance from meters (m) to kilometers (km) before adding it to the bike and run distances which are already in km. To convert 500 meters to kilometers, divide the distance by 1000 to get 0.5km then add the remaining distances:

total distance = swim + bike + run
total distance = 0.5km + 50.9km + 12.4km
total distance = 63.8km

A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{1}{9} \) x \( \frac{2}{6} \) = \( \frac{1 x 2}{9 x 6} \) = \( \frac{2}{54} \) = \(\frac{1}{27}\)

A factor is a positive integer that divides evenly into a given number. For example, the factors of 8 are 1, 2, 4, and 8.