Question

the sum of the two digit of a two digit number is 9.the no is 6 times the unit digit find the no
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Answer 1

Let no at tens place be x.

Let no at ones place be y.

A.T.Q,

x+y=9. -(1)

10x+y=6y

10x - 5y =0

2x - y =0

y = 2x

Put in (1)

3x=9

x=3

y=6

no is 36