Question 49354
amount of nickels = n
amount of dimes = d
{{{d + n = 50}}} which can mean: {{{n = 50 - d}}}
{{{0.1d + 0.05n = 3.5}}}
plug:
{{{0.1d + 0.05(50 - d) = 3.5}}}
{{{0.1d + 2.5 - 0.05d = 3.5}}}
{{{0.05d = 1}}}
{{{d = 20}}}
plug:
{{{n = 50 - d}}}
{{{n = 50 - 20 = 30}}}
20 dimes and 30 nickels