Write this ratio as a fraction in lowest terms.
90 minutes to 20 minutes
The ratio can be written as 90:20. To find the fraction in lowest terms, we divide both the numerator and denominator by their greatest common divisor. The greatest common divisor of 90 and 20 is 10.
Dividing 90 by 10 gives us 9, and dividing 20 by 10 gives us 2.
Therefore, the ratio 90 minutes to 20 minutes can be expressed as the fraction 9/2 in lowest terms.