Question

6RS
+RR4
PQPQ

P,Q,R and S represents four different digits. what digit does S represents?

(A)1
(B)2
(C)5
(D)6
(E)8

I think the answear is 6 but now sure. Am i correct? How do you figure this problem?

The answer is (E)8. The rest of the letters are as follows: P = 1, Q = 2, and R = 5.

658 + 554 = 1212

I used "trial and error" with the numbers you were given to work out this problem.