SOLUTION: A glass containing 250ml of 80% iodine solution tips over spilling parts of its contents. This was subsequently replaced by an equal amount from a mixture of 40% iodine. If a 72%

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Question 879721: A glass containing 250ml of 80% iodine solution tips over spilling parts of its contents. This was subsequently replaced by an equal amount from a mixture of 40% iodine. If a 72% solution is resulted, how much was spilled?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
%28250%2A80-v%2A80%2Bv%2A40%29%2F250=72
%28250%2A80%2B%2840-80%29v%29%2F250=72
%28250%2A80-40v%29%2F250=72
250%2A80-40v=250%2A72
250%2A80-250%2A72=40v
250%2A8=40v
v=25%2A2
highlight%28v=50%29, volume spilled and replaced, mililiters.

This works just like other drain-and-replace problems:
Drain and Replace: Radiator Antifreeze Mixture