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Question
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?
53
63
73
83
ANSWER : 2
Descrption
<p>Let,</p> <p>The number = 10x + 3</p> <p>ATQ,</p> <p>7(x + 3) = 10x + 3</p> <p>⇒7x + 21 = 10x + 3</p> <p>⇒21 - 3 = 10x 7x</p> <p>⇒3x = 18</p> <p>⇒x = 6</p> <p>The number = 10 × 6 + 3 = 63.</p>
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