Since Tracy can jump rope 26 times in a minute, we can make a equation.
- [tex]1\:minute=60\:seconds[/tex]
Now here is our equation
[tex]\frac{26}{60} =\frac{x}{90}[/tex]
cross-multiply
[tex]60x=2340[/tex]
do simple algebra and divide
[tex]x=39[/tex]
Tracy can jump rope 39 times in 90 seconds.
