Question 994909
q = number of 25 centavo coins
p = number of 1 peso coins


q = 5p
0.25q + p = 281.25


Substitute the first equation into the second.


0.25(5p) + p = 281.25
2.25p = 281.25
p = 125


There are 125 one-peso coins and 625 25-centavo coins.