# Easy Number System Solved QuestionAptitude Discussion

 Q. The number 3 divides ‘$a$’ with a result of ‘$b$’ and a remainder of 2. The number 3 divides ‘$b$’ with a result of 2 and a remainder of 1. What is the value of $a$?
 ✖ A. 13 ✖ B. 17 ✖ C. 21 ✔ D. 23

Solution:
Option(D) is correct

Since 3 divides $b$ with a result of 2 and a remainder of 1, $b = 2×3 + 1 = 7$.

Since number 3 divides a with a result of $b$ (which we now know equals 7) and a remainder of 2, $a = b×3 + 2 = 7×3 + 2 =$ 23.