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Answers
Let the two digit number be 10x + 2x, i. e., 12x. (The two digit number is written in the form of 10x + y. Here, 2x = y. )
Sum of the digits = x + 2x = 3x
12x ÷ 3x = 4
If 12x divided by 3x gives 4, x will include the value of 1, 2, 3, 4, but not 5 and higher, because twice of them are two digit numbers and can't be written as a digit of a number.
If x = 1, 12x = 12 × 1 = 12 & 3x = 3 × 1 = 3
12 ÷ 3 = 4
If x = 2, 12x = 12 × 2 = 24 & 3x = 3 × 2 = 6
24 ÷ 6 = 4
If x = 3, 12x = 12 × 3 = 36 & 3x = 3 × 3 = 9
36 ÷ 9 = 4
If x = 4, 12x = 12 × 4 = 48 & 3x = 3 × 4 = 12
48 ÷ 12 = 4
But if x = 5, 12x = 12 × 5 = 60. Here unit digit 0 is not twice of tens digit 6. So it can't be written. The same is done in the case of 6, 7, 8 and 9.
So the two digit number, the answer, includes 12, 24, 36 and 48.
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Whats the question? Because all I see is a textbook saying that the digit in the unit place is bigger then the digit in the tens place
