Question 171098
d=n+3 and q=n-2


5n+10d+25q=580


substituting __ 5n+10(n+3)+25(n-2)=580 __ 5n+10n+30+25n-50=580 __ 40n-20=580


adding 20 __ 40n=600


dividing by 40 __ n=15