Brain­teasers

Chal­lenge your­self by solv­ing these puz­zles and mind stretch­ers, then check your an­swers on page 112.

Reader's Digest International - - Contents -

UN­KNOWN AREA

(Moder­ately dif­fi­cult)

If the outer shape is a perfect square and the num­bers in­di­cate the lengths of the cor­re­spond­ing line seg­ments in cen­time­tres, what is the area of A?

HAPPY CAMPERS

(Moder­ately dif­fi­cult)

You just bought nine beau­ti­ful lake­side camp­sites, which you can rent out to campers with tents for $20 per camp­site per evening. You can also up­grade them with elec­tri­cal hookups: this will cost you $60 per camp­site but will al­low you to rent them to RVers for $40 per evening. Sup­pose you can al­ways fill your camp­ground to ca­pac­ity. If you’re start­ing with­out any cash on hand, how many nights will pass be­fore you’ll be able to up­grade all nine sites?

PATH PUZ­ZLE REDUX

(Dif­fi­cult)

Draw a path that leads from any one of the grid’s open­ings to any other. As the path winds from one cell to the next, it can move up, down, left or right but not di­ag­o­nally. It can­not pass through any cell more than once. The num­bers around the grid tell how many cells the path must pass through in the cor­re­spond­ing row or col­umn. Num­bers ad­ja­cent to both a row and a col­umn rep­re­sent the to­tal num­ber of cells in the path from both the row and the col­umn. If a row or col­umn has no num­ber, then the path may pass through as many or as few cells as you’d like.

GET­TING TO THE ROOT

(Moder­ately dif­fi­cult) What num­ber is x?

THE LONG AND SHORT OF IT

(Easy)

Six neigh­bor­hood chil­dren—Leisha, Ben­ito, Delia, Char­lotte, Wel­don and Zina—were mea­sured yes­ter­day. Wel­don is taller than Delia but shorter than Zina. Leisha is taller than Ben­ito but shorter than Delia and Wel­don. Ben­ito is not the short­est. List the kids in order of height from tallest to short­est.

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