Brain­teasers: An­swers

Reader's Digest International - - Bonus Read -

UN­KNOWN AREA

20 cm2. Each side of the square is 6 cm in length, so the to­tal area is 36 cm2. The area of A is the area of the square mi­nus the sum of the ar­eas of the three tri­an­gles.

HAPPY CAMPERS

Three. On the first night, you’ll host nine tents and make $180, which you’ll use to up­grade three sites. On the sec­ond night you’ll host three RVs and six tents, earn­ing $240, let­ting you up­grade an­other four sites. On the third night you’ll host seven RVs and two tents, earn­ing you more than enough to up­grade the last two.

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