Question 463105
let the number = abcde
(a, b, c, d, and e should be whole numbers/integers)

the number is greater than 50,000 but less than 70,000, so the possibility of the value of "a" is 5 or 6

ones digit and tens digit are the same: e = d
ten thousand digit is three times the sum of ones and tens digits: 
a = 3*(e + d)
a = 3*(d + d)
a = 3*2d
a = 6d

thousands digit and hundreds digit are half of ten thousand digit
b = 1/2 * a = 1/2 * 6d = 3d
c = 1/2 * a = 1/2 * 6d = 3d


if a = 5 then 5 = 6d -> d = 6/5 (not a whole number)
so a = 6
6 = 6d -> d = 6/6 = 1
e = d = 1
b = 3d = 3*1 = 3
c = 3d = 3*1 = 3


so, the number is 63311