the digits of a two digit number differ by 3 . If digits are interchanged and the resulting number is added to the original number .we get 1

Question

the digits of a two digit number differ by 3 . If digits are interchanged and the resulting number is added to the original number .we get 121 . Find the original number???

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1 month 2021-08-12T13:06:47+00:00 2 Answers 0 views 0

It is given that the sum is 121. The units digit is 4 and therefore the tens digit is 4 + 3 = 7. Hence, the number is 74 or 47

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Let us take the two digit number such that the digit in the units place is x. The digit

in the tens place differs from x by 3. Let us take it as x + 3. So the two-digit number is

10 (x + 3) + x = 10x + 30 + x = 11x + 30.

With interchange of digits, the resulting two-digit number will be 10x + (x + 3) = 11x + 3

If we add these two two-digit numbers, their sum is

(11x + 30) + (11x + 3) = 11x + 11x + 30 + 3 = 22x + 33

It is given that the sum is 121.

Therefore, 22x + 33 = 121

22x = 121 – 33

22x = 88

x=4

The units digit is 4 and therefore the tens digit is 4 + 3 = 7.

Hence, the number is 74 or 47.

Step-by-step explanation: