Question 165599
n=Nickels d=dimes so n=d+3 and n+d=25 so substituting n's value from the 1st equation into the 2nd equation we get (d+3)+d=25 or 2d+3=25 and subtracting 3 from each side we get 2d=22 so d=11 and since n=d(11)=3 then n=14 
so there are 14 nickels and 11 dimes