A two digit number has 3 in its unit digit. The sum its digits is one seventh of the number itsself. What is the number?
A
53
B
63
C
73
D
83
Correct Answer: 63
Let, The number = 10x + 3 ATQ, 7(x + 3) = 10x + 3 ⇒7x + 21 = 10x + 3 ⇒21 - 3 = 10x 7x ⇒3x = 18 ⇒x = 6 The number = 10 × 6 + 3 = 63.