A is 5 years younger than B who is three times as old as C.If C was 10 years old 4 years ago,how old will A be after 6 years?????

C was 10 years old 4 years ago.
So, present age of C is (10 + 4) i.e. 14 years.
Now, B is three times as old as C.
So, Present age of B = $14\times 3$ = 42 years
And A is 5 years younger than B.
So, present age of A = 42 - 5 = 37 years.
Then after 6 years, age of A = 37 + 6 = 43 years.

Therefore, A will be 43 years old after 6 years.