Question 321402
the number is 10t + u


t = u + 5


10t + u - 3 = 2(10u + t + 2) ___ 10t + u - 3 = 20u + 2t + 4 ___ 8t = 19u + 7


substituting ___ 8(u + 5) = 19u + 7 ___ 33 = 11u ___ 3 = u


substituting ___ t = (3) + 5 = 8


the number is 83