So, to ensure that two sliders in the same question always total to 100, you can add a script like this to the question source:
Code:
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
// Identify this question
var thisQuestion = $('#question{QID}');
$('.ui-slider', thisQuestion).on('slide', function(event, ui) {
var thisQuestion = $(this).closest('.numeric-multi');
var thisRow = $(this).closest('li.answer-item');
var otherRow = $('li.answer-item', thisQuestion).not(thisRow);
$('.ui-slider', otherRow).slider('option', 'value', 100-ui.value);
$('input.text', otherRow).val($('.ui-slider', otherRow).slider('option', 'value').toString().replace(/\./, LSvar.sLEMradix));
$('.slider_callout', otherRow).text($('input.text', otherRow).val());
});
});
</script>
