Question

one of the digits of a two digit number is 3 times the other if you interchange the digits of this two digit number and add the resulting no. to the original number, you get 132. what is the original no. ?

Answer 1

Let the digit in units place = x

The digit in tens place = 3x

The number is 10(3x) + x = 31x

When the digits are interchanged we will get the number 13x(10(x) + 3x)

31x + 13x = 132

44x = 132

∴ x = 132/44 = 3

number is 39

Answer 2

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