Q. Consider the following multiplication problem:
(PQ) x 3 = RQQ, where P, Q and R are different digits and R ≠ 0.
What is the value of (P + R) ÷ Q?
Here Q×3=a no. which has ‘Q’ in its unit’s place, and this happens only for P=5 (as 5 x 3 = 15). Also, P×3+1 (1 is carryover from 15) = R5. This will happen only when P=8 (as 8 x 3 + 1 = 25). Hence, P=8,R=2 and Q=5. Now (8+2)÷5=10÷2=5.