Can someone post the solution please?

7 houses get all three papers.

13 get the Sun and the Mirror (and possibly the Mail), so 6 houses get only the Sun and the Mirror.
16 get the Sun and the Mail (and possibly the Mirror), so 9 houses get only the Sun and the Mail.

Finally, 26 get the Mail. The rest, or 14 houses, must get the Sun only, the Sun and the Mirror only, or the Mirror only. But we know 0 get the Sun only, and 6 get the Sun and the Mirror only. The remaining 8 must get the Mirror only. Since 24 houses in total get the Mirror, and since 7 get all three, 6 get the Sun and Mirror only, and 8 get the Mirror only, the remaining 3 houses must get only the Mirror and the Mail.

So 6 + 9 + 3 = 18 houses get exactly two papers.

Of course it's easier to draw a Venn diagram when working all of this out.
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