Question 1204890
Solutions, or physical mixtures of some other kind?


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A scientist has two {{{cross(solutions)}}} MIXTURES, which she has labeled MIXTURE A and MIXTURE B. Each contains salt. She knows that MIXTURE A is 45% salt and MIXTURE B is 95% salt. She wants to obtain 90 <u>ounces</u> of a mixture that is 65% salt. How many ounces of each A and B should she use?
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b, amount of mixture B
90-b, amount of mixture A


{{{45(90-b)+95b=65*90}}}


{{{45*90-45b+95b=65*90}}}
{{{(95-45)b=65*90-45*90}}}
{{{b=90((65-45)/(95-45))}}}

{{{b=90(20/50)}}}

{{{b=90(2/5)}}}

{{{highlight(b=36)}}}------------how many ounces of mixture B