Problem Of The Week 8

Let x and y be real nos such that

[x] + 3{y}=3.9 and

{x} + 3[y]=3.4

[z] and {z} have their usual meanings.

Find the number of ordered pairs (x,y).

a) 0                    b) 1                   c) 2                     d)  3                        e) none of these