Question 1078587
{{{laughers}}}= number of people who laughed
{{{solid}}}= number of people who did not laugh
There was a total of 7600 people. 
Since {{{laughers+solid=7600}}} , {{{laughers=7600-solid}}} .
 
We are told that
{{{laughers/solid=2/17}}} , so {{{(7600-solid)/solid=2/17}}} .
 
We solve for {{{solid}}} :
{{{(7600-solid)/solid=2/17}}}
{{{17*(7600-solid)=2*solid}}}
{{{17*7600-17*solid)=2*solid}}}
{{{17*7600=17*solid+2*solid}}}
{{{17*7600=(17+2)*solid}}}
{{{17*7600=19*solid}}}
{{{17*7600/19=solid}}}
{{{6800=solid}}}
There were {{{highlight(6800)}}} who did not laugh among the 7600 in the throng.