Question

the sum of the digit of a two digit number is 9 the number is 6 times the unit digit find the number

Answer 1

let unit digit be x
ten's digit= 9-x
the number= 10(9-x)+x
= 90-9x
6x=90-9x
15x=90
x= 90/15

x= 6
9-x= 3
so the no is 36
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