Question 1130437
n+q=50
q=50-n


{{{5n+25(50-n)=990}}}

{{{5n-25n+25*50=990}}}

{{{-20n=990-25*50}}}

{{{n=13}}}

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{{{q=37}}}

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check:  0.05*13+0.25*37=9.9


13 nickels and 37 quarters