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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 150 mL from the beaker, and adds 150 mL of water. How many mL of water are now in the beaker?

 Aug 27, 2023
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150 * 0.80 ==120 mL is acid poured out


150  -  120 ==30 mL of water is poured out


200 - 30 + 150 ==320 ml - water content after first pour.


800 - 120 ==680 mL - is acid content after first pour.


320 / [320 + 680] ==32% is now water content


68% is now acid content.


150 * 0.32 ==48 mL of water is poured out the 2nd time


150 * 0.68 ==102 mL of acid is poured out the 2nd time


320 - 48 + 150 ==422 mL is water now.


680 - 102 ==578 mL is acid now.

 Aug 28, 2023

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