Four-digit number

For a four-digit number abcd, ab: bc = 1: 3 and bc: cd = 2: 1 (ab, bc and cd are two-digit numbers from digits
a, b, c, d). Find this number(s).

Correct answer:

x1 =  1421
x2 =  2842

Step-by-step explanation:

x1=1421 ab1=14 bc1=42 cd1=21 t11=3 ab1=3 14=42 t21=2 cd1=2 21=42 t11=t21=bc1
x2=2842 ab2=28 bc2=84 cd2=42 t12=3 ab2=3 28=84 t22=2 cd2=2 42=84 t12=t22=bc2



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