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January 30, 2015

January 30, 2015

Posted by **dj** on Wednesday, September 28, 2011 at 7:21pm.

- math -
**Steve**, Thursday, September 29, 2011 at 12:24amThe number is abcd

b+a = 3

c = 7b

d = 3a

Since c=7b, b = 0 or 1, or else the product would be > 10

b is not 0, or 7b would also be 0, and all digits are different. S, we now have

a17d

b+a=3, so a = 2:

217d

d=3a, so d=6 and our number is

2176

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