Have percent value update as user drags slider?

Hi all,

I have a question slide, where the user needs to select the answer by dragging a slider to the correct percentage. I need to have 2 variables display values of percent, which update as the user drags the slider; one to display the percent of area exposed on either side of the slider.  How can achieve this? I have no experience with variables. TIA

Attached: 1st 2 slides show the requirements, 3rd slide is my working version.

 

Monica

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