Latest Syntel Aptitude Question SOLUTION: A two digit number is 4 times to its sum of digits , when 9 is added to the number, the digits will get reversed. Then what is that number?

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A two digit number is 4 times to its sum of digits , when 9 is added to the number, the digits will get reversed. Then what is that number?

Asked In Syntel (13 years ago)

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Sanjana Patnaik  (13 years ago)

The Answer is 12
From the above, the following equation can be arrived:
(10x+y)-(10y+x)=9
solving we get x-y=-1
There are so many possibilities of different values of x,y vix
(1,2),(2,3)(3,4),(4,5)(5,6),(6,7),(8,9)
But from the above possibilities, the condition satsfies is the number 12

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Ajay dixit  (11 years ago)

two digit no will start from 10
addition 1 + 0 = 1 * 4 = 4+9=13
1 + 1 = 2 * 4 = 8+9=17
1 + 2 = 3 * 4 = 12+9=21 hence ans is 12...

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Rajesh Mothe  (10 years ago)

let no will be 10x+y
1st condition :
10x+y = 4x+4Y
so, 2x-y = 0 ......(1)
2nd condition :
10x+y+9 = 10y+x
so, x-y = -1 .......(2)
solve (1) & (2)
x=1 $ y=2
so, 10x+y = 12
so no is 12...

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