Question 324111
Let T be the number of tens, F the number of fives.
1.{{{T+F=110}}}
2.{{{10T+5F=940}}}
Multiply eq. 1 by -5 and add to eq. 2 to eliminate F.
{{{-5T-5T+10T+5F=-550+940}}}
{{{5T=390}}}
{{{highlight(T=78)}}}
Then from eq. 1,
{{{78+F=110}}}
{{{highlight(F=32)}}}