Answer:
5:3.
Explanation:
Riley can dribble a basketball 50 times in 1/2 minute with her right hand and 30 times in 1/2 minute with her left hand.
Rate of her right hand is :
![(50)/((1/2))=100\ \text{per minute}](https://img.qammunity.org/2022/formulas/mathematics/high-school/kprgi21h9la00wp75n60d1wi2xkzxdt40q.png)
Rate of her left hand is :
![(30)/((1/2))=60\ \text{per minute}](https://img.qammunity.org/2022/formulas/mathematics/high-school/pvxk4cvg8uarw84gxet51a595hr1hp1fyp.png)
Ratio of her right hand to her left hand dribbling rate :
![(100)/(60)=(5)/(3)](https://img.qammunity.org/2022/formulas/mathematics/high-school/defce1994b9ptfh6sb3iz1dih3okv8dt0w.png)
So, the required ratio is 5:3.