Problema Solution
A number of two digit is such that twice the tenth digit is 6 greater than the unit digits.When the digits are reversed,the number is increased by 9.
Answer provided by our tutors
let number is 10*x + y where x and y are between 0 and 9
then from given information we have
2*x = y + 6 and 10x + y + 9 =10y + x
from 1st we get y= 2*x - 6 now put it into 2nd
9(2x - 6) -9x = 9 ==> x= 63/9 = 7
now y = 2x - 6 = 14 - 6 = 8
so numbr is 87