Five years ago, Sandra was 63 years older than her grandson  , at the same time, 
she was 4 times as old as the grandson.


Let x be the grandson age five years ago. Then Sandra's age five years ago is 4x,
according to the problem's description.


So we can write an equation

    4x - x = 63,  or  3x = 63,  which implies  x = 63/3 = 21.


Thus, five years ago the grandson was 21 years old;
hence, Sandra was 4*21 = 84 years old five years ago.


So, now Sandra is 84 + 5 = 89 years old.    ANSWER

Let S be Sandra's age
Then grandson is: S - 63
We then get: S - 5 = 4(S - 63 - 5)
             S - 5 = 4(S - 68)
             S - 5 = 4S - 272
            S - 4S = - 272 + 5
              - 3S = - 267
Sandra's age, or