Question 170881
{{{5/7=k}}} which means that all proportions must equal the ratio 5 to 7
:
our new mixture is {{{8/12=2/3=.667}}} which in not equal to {{{5/7=.714}}}
:
another way to show they are not equal is to find the least common denominator

close but no cigar{{{system(5/7=15/21,2/3=14/21)}}}