Ultraglide
Advanced Member
Canada
299 Posts 
Posted  09/24/2007 : 16:51:24

If you take a quarter of the original solution away you have 7.5 parts out of 75. When combined with the new solution giving 16%, you have added 167.5 or 8.5%. Taking this as a percent of the new solution, i.e. 8.5% out of one quarter gives 34% (multiply by 4 to get 100%)


