St. Louis' Webzine for Kids
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February 2010 Vol. 11 Issue 2


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St. Louis History
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Answers


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Pro Hopeful's Bid and Plan B
Read, Right, Run
Make Me a Movie

At Your Library
County Library Art
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Bird Feeders
Mastodon kid

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Math
Math Answers

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Answers for January "Fun with Math"

Nine kids get all answers correct

A total of nine kids answered all of the "Fun with Math" puzzles correctly in January's competition.

So far, puzzle-maker George Yu hasn't given you many puzzles that have been too difficult for many of you.

Because there were a large number of winners, Young Saint Louis.com again has expanded to three the number of winners who get $10 Borders gift certificates. From a random drawing of the nine winning entries, the three who will receive the gift certificates were:

John Bentley of Edwardsville, IL; Monica Chavan of Edwardsville, IL, and Raymond L of Clayton, MO.

Other kids who got all of the January puzzles correct were:

Samay Gupchup of Edwardsville, IL; Dani Kirsch of Edwardsville, IL; Durga Kullakanda of Maryland Heights, MO; Henry Lu of Edwardsville, IL; Sean Mulligan of Edwardsville, IL, and Ryan Wahidi of Creve Coeur, MO.

(If you'd like to enter the February, 2010, "Fun with Math" contest, click here.)

Solution for the January, 2010, "Fun with Math" questions

  1. If all 10 animals are chickens, then the farmer will have 20 legs. She is 26-20=6 legs short. Switching one rabbit for one chicken gives 4-2=2 more legs. Since the farmer needs 6 more legs, she needs 6/2 = 3 rabbits. There are 10-3=7 chickens.

  2. If all arthropods are ants, then the collector will have 90 legs. He is 98-90=8 legs short. Switching one spider for one ant gives 8-6=2 more legs. Since the collector need 8 more legs, he needs 8/2=4 spiders. There are 15-4=11 spiders.

  3. If Abby has 25 nickels, then she will have $1.25. She is $2.65-$1.25=$1.40 short. Switching one quarter for one nickel gives 25-5= 20 more cents. Since Abby needs $1.40 more, she needs $1.40/20 = 7 quarters. There are 25-7=18 nickels.
 

 


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