Question 126287
{{{a}}} = number of adult tickets bought
{{{c}}} = number of childrens tickets bought
{{{2a + 1.5c = 800}}}
{{{a + c = 500}}}
{{{c = 500 - a}}}
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{{{2a + 1.5(500 - a) = 800}}}
{{{2a + 750 - 1.5a = 800}}}
{{{.5a = 50}}}
{{{a = 100}}} answer
100 adults bought tickets
check answer
{{{c = 500 - a}}}
{{{c = 500 - 100}}}
{{{c = 400}}}
{{{2a + 1.5c = 800}}}
{{{2*100 + 1.5*400 = 800}}}
{{{200 + 600 = 800}}}
{{{800 = 800}}}
OK