Question 123386
Let {{{s}}} = calories in sandwich
Let {{{m}}} = calories in milk
{{{s + 2*m = 660}}}
{{{s = 2.4*m}}}
substitute {{{s}}} in the 2nd equation for
{{{S}}} in the 1st
{{{2.4*m + 2*m = 660}}}
{{{4.4*m = 660}}}
{{{m = 150}}} calories
Now find {{{s}}}
{{{s = 2.4*m}}}
{{{s = 2.4*150}}}
{{{s = 360}}} calories in sandwich