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hemant balde Grade:
        

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?

6 years ago

Answers : (1)

Sudheesh Singanamalla
114 Points
										

let 2 digit number is 10x+y where x is tens and y is ones place.


4*(x+y) =  10x + y


==> 4x + 4y = 10x + 10y


==> -6y = 6x


x + y  = 0 ------------------------ (1)


10x + y + 9 = 10y + x


9x - 9y = -9


x-y = -1 ----------------------------- (2)


solving (1) & (2) we get


2x = -1


x = -1/2


y = 1/2


number = 10y+x = 5 - 1/2 = 9/2

6 years ago
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