Question

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Aa competition of selected brainy app in genius of genius........

1 ) a two digit is 36 more than the number obtained by reversing the digit. if difference between tens digit and unit digit is 4 . ( tens digit>unit digit) find the number.

this question is very interesting...

full process explain with concept..

no cheat try because it's first on world................

Answer 1

Let’s say that this number has x as its tens digit and y as its units digit so the number is 10x+y. When the digits are reversed the number becomes 10y+x. The difference is 36 so,

(10x+y) - (10y+x) = 36

9x -9y = 36

x - y = 4

The difference between x and y is 4 so this has been confirmed that x > y.

Anyway the possibilities are 5–1=4, 6–2=4, 7–3=4, 8–4=4 and 9–5=4.

So, the number could be 51, 62, 73, 84 or 95.

Answer 2

t=tens digit u= unit digit

So the number is10t+u

And when we reverse it,

It is10u+t

The difference is 36 so

(10t+u)-(10u+t)=36

9t-9u=36

t-u=4

We were told the difference between t and u is 4 so it is merely confirmed t>u

So the possibilities are 5-1=4 , 6-2=4 , 7-3=4 , 8-4=4, 9-5=4..

So the numbers would be 51 , 62 , 73, 84 , 95.