Question 839798
{{{S/C=6/5}}}
1.{{{5S=6C}}}
.
.
2.{{{S+C=220}}}
{{{5S+5C=1100}}}
Then substitute from eq. 1,
{{{6C+5C=1100}}}
{{{11C=1100}}}
{{{C=100}}}
Then from eq. 2,
{{{S=220-100}}}
{{{S=120}}}