Question 1132679
In a four digit number,
a, b, c, d
 the sum of the thousands and the hundreds digits is 3.
a + b = 3
 The tens digit is four times the hundreds digit.
c = 4b
 The ones digit is seven more than the hundreds digit.
d = b + 7
 no two digits are equal. What is the four digit number? 
We know that b=1, a= 2 or b=2, a=1
if b=1, then a=2
c = 4(1)
c = 4
and
d = 1 + 7
d = 8
then 2148 is the number
:
If b=2 then a=1
c = 4(2)
c = 8
and
d = 2 + 7
c = 9
then 1289 is the number