Question 1124457
{{{system(x+y=75,10x+25y=1500)}}}


{{{system(x+y=75,2x+5y=300)}}}


{{{2(75-y)+5y=300}}}

{{{150-2y+5y=300}}}

{{{3y=150}}}

{{{y=50}}}
-
{{{therefore}}}{{{x=25}}}
-



25 of 10-centavo coins
50 of 25-centavo coins