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  Reasoning

Getting Across		  
Q Ms. Waters and her twins, Danny and Anny, want to cross from the east side of the river to the west side in a canoe. But the canoe can hold no more than 200 pounds. Ms. Waters weighs 160 pounds, and Danny and Anny weigh 100 pounds each.

How can all three of them reach the other side of the river in the canoe?


  
A First the twins paddle to the west side of the river. Anny stays on the west side, and Danny comes back. Mrs. Waters rows alone to the west side, leaving Danny on the east side. Finally, Anny comes back for Danny.

Together, they paddle to the west side of the river. (You can reverse Anny and Danny-it doesn't matter which one goes first.)