4 The sum of the digits of a two digit number is 7. If the digits are reversed, the new
number increased by 3 equals 4 times the original number. Find the number.
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13
SOLUTION :-
Let ,
Digit in ten's place = x
Digit in one's place = y
Two digit number = 10x + y
According to the first condition ,
According to the second condition ,
Equation (1) × 2
Equation (2) + Equation (3)
Substitute x = 1 in equation (1) ,
Two digit number = 16
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