Question 1103983
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David adds 300 mL of water to 450 mL of 60% alcohol solution so as to dilute its concentration to ....
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{{{450*60/(450+300)}}}


{{{450*60/750}}}


{{{45*60/75}}}

{{{(9*5*3*20)/(3*5*5)}}}


{{{(9*5*3*5*4)/(3*5*5)}}}


{{{36}}}


36% alcohol solution result.
Did he add too much water?  YES, because he wanted "40%" alcohol.