Question 285557
Let {{{n}}} = number in nickels in jar
Let {{{q}}} = number of quarters in jar
given:
{{{q = .1n}}}
{{{5n + 25q = 525}}} ( in cents)
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This is 2 equations and 2 unknowns, so it's solvable
By substitutiuon:
{{{5n + 25*(.1n) = 525}}}
{{{5n + 2.5n = 525}}}
{{{7.5n = 525}}}
{{{n = 70}}}
He has 70 nickels
check:
{{{q = .1*n}}}
{{{q = .1*70}}}
{{{q = 7}}}
and
{{{5n + 25q = 525}}}
{{{5*70 + 25*7 = 525}}}
{{{350 + 175 = 525}}}
{{{525 = 525}}}
OK