Question

The ones’ digit of a two-unit digit number is twice its tens digit. If the digits are interchanged, the new number will be 36 more than the original number. What is the original number?

Answer 1

Answer :-

Let digits at ten's place = x

So,

digits at one's place = 2x .

A/q,

→ Interchanged number - original number = 36

→ [10*2x + x] - [10*x + 2x] = 36

→ 21x - 12x = 36

→ 9x = 36

→ x = 4 .

then,

→ Original number = 10x + 2x = 10*4 + 2*4 = 40 + 8 = 48 (Ans.)

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