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December 18, 2014

December 18, 2014

Posted by **Malena** on Tuesday, February 1, 2011 at 8:55pm.

1/5 of the boys are absent and 2/5 of the girls are absent in Drew’s class. Bert thinks that you multiply, so his answer is 2/5 of the class are out. Elmo thinks that means 3/5 of the class is out. Ernie thinks 3/10 of the class is out. Kermit didn’t find out how much of the class are out, but he thinks the answer is between 1/5 and 2/5. Analyze each person’s answer to find out who is right. Then determine who knows the most math.

- math -
**Reiny**, Tuesday, February 1, 2011 at 9:10pmabsent: b/5 + 2g/5

= (b+2g)/5

fraction absent = (b+2g)/(5b+5g)

...going nowhere

take an example,

suppose there are 25 boys and 30 girls or 55 total

boys missing = 5

girls missing = 12

total missing = 17

fraction missing = 17/55

which is none of 2/5, 3/5, or 3/10

now 1/5 = 11/55

and 2/5 = 22/55

mmmh?

- math -
**Someone**, Thursday, March 17, 2011 at 4:06pmElmo is correct because 1/5+2/5=3/5.

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