The sum of two integers is 36, and the difference is 6. What is the smaller of the two numbers?

A 21

B 15

C 16

D 18

Correct Answer: Option B

সংখ্যাদ্বয় x ও y যেখানে x>y
∴x+y=36...........i
x-y=6.......ii
i-ii
বা, 2y=30
বা,y=15