Question 129581
Let {{{j}}}= number of 8-ticket booklets
Let {{{k}}}= number of 20-ticket booklets
{{{j = 20k}}}
{{{8j + 20k = 3600}}}
{{{8(20k) + 20k = 3600}}}
{{{160k + 20k = 3600}}}
{{{180k = 3600}}}
{{{k = 20}}}
{{{j = 20*20}}}
{{{j = 400}}}
Twenty 20-ticket booklets were sold
check:
{{{8j + 20k = 3600}}}
{{{8*400 + 20*20 = 3600}}}
{{{3200 + 400 = 3600}}}
{{{3600 = 3600}}}
OK