Question 1103625
25q+10d=455
4q=d

25q+10*4q=455
divide by 5
5q+8q=91
13q=91
q=91/13
q=7
d=28
check
25q+10d=455
25*7+10*28=455
175+280=455
ok

Alan's hint is saying to divide 455/65 which equals 7 to save time and effort.