Slider block with multiple questions (each with a range of 0-100) with total of question = 100

I'm trying to present a slider question block that asked respondents to select a percentage (in this case, % of time they spend working in a specific market.) There are 3 sliders in the block. I need to create or use a validation that will force the respondent to select a value for each slider that is between 0-100 AND the total values selected for the three slides MUST TOTAL 100. Ex: I spend 30% of my time on X, 20% of my time on Y, 50% of my time on Z: X+Y+Z must equal 100. Any ideas on how to accomplish this?