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Puzzles to test mathematical skills, set by Anita Straker. Solutions below More brainteasers on LIBRARY AREA

A rectangular library area is screened off into four smaller rectangular areas.

The areas of three of the smaller areas are 12, 18 and 30 square metres What is the area of the library?


Beads are threaded on a string in blocks of seven: first 7 red beads, then 7 blue beads, then 7 red beads, then 7 blue beads, and so on.

The beads are then numbered in order 1, 2, 3, 4, I What colour is the 400th bead?

What number is on the 400th bead?

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