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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.
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Answers
Answered by
12
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.
vikram991:
right answers is 62
Answered by
5
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.
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