Raymond B. answered • 01/18/26
Tutor
5
(2)
Math, microeconomics or criminal justice
4 times a 4 digit number = the same number but in reverse order
what is the number??
4abcd = dcba
4(1000a + 100b + 10c + d) = 1000d +100c +10b +a
= 4000a +400b +40c +4d
4d = a, 4000a = 1000d, 4a =d and 4d=a 4(4d) = d
a = d = 0
400b = 100c and 10b =40c, b=c/4 = 4c b=c = 0
the number is
0000
