Q. The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the 2 digit number?
Q. दो अंकों की संख्या के अंकों का योग 15 है और उनके अंकों का अंतर 3 है।वह संख्या क्या है?
It is given that,
Sum of the digits is 15.
⇒x+y=15---(1)
Difference of digits is 3
⇒x−y=3 ---(2) (OR) y−x=3 ---(3)
case 1:
Add (1) and (2),
x+y+x−y=15+3
⇒2x=18
⇒x=182
⇒x=9
and x+y=15
⇒9+y=15
⇒y=15−9=6
Therefore, the number is 96.
case 2:
Add (1) and (3),
x+y−x+y=15+3
⇒2y=18
⇒y=182
⇒y=9
and x+y=15
⇒x+9=15
⇒x=15−9=6
Therefore, the number is 69.
So, from (1) and (2) the number is either 69 or 96, which cannot be determined