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Ruth has a beaker containing a solution of $800$ mL of acid and $200$ mL of water.  She thinks the solution is a little strong, so she drains $150$ mL from the beaker, adds $150$ mL of water, and stirs the solution.  Ruth thinks the solution is still too strong, so again she drains $250$ mL from the beaker, and adds $250$ mL of water.  How many mL of water are now in the beaker?

 Oct 24, 2023
 #1
avatar+36919 
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Original volume 1000 cc      200  is water    ( 1/5 is water) 

    draining 150  removes  1/5 * 150 = 30 cc water   now there is 170 water 

       add 150 water     now there is 320 water in 1000 cc 

          draining 250 removes   320 /1000 * 250 = 80 cc water      Now there is 240 water 

              adding 250 cc water makes 490 water in 1000 cc 

 Oct 25, 2023

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