India, March 9 -- One of last week's mathematical puzzles proved tougher than I had thought, with a couple of veteran Problematics solvers stumbling on it. The crossword of Indian states, on the other hand, was probably taxing to fill up although it was a sitter to solve.

Both of this week's puzzles come under the logic category, with the second involving numbers.

#Puzzle 185.1

Meet a family in which the parents have imaginatively named their four daughters Lily, Leela, Leena and Lulu. They are attending a birthday party, each wearing a bright ribbon of a solid colour (i.e. no dots, stripes or any kind of printed pattern).

(1) Lily has exactly two sisters wearing red ribbons.

(2) Leela has exactly two sisters who are not wearing a bl...