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January 27, 2015

January 27, 2015

Posted by **Randy** on Wednesday, December 5, 2012 at 8:32pm.

-Four students tried to find the sum of the first 21 positive prime numbers. Bob got 709, Ned got 711, Matt got 712, and Lee got 713. Who was correct?

-The stegosaurus was 30 feet in length, weighed about 3500 pounds and had a brain that weighed only 3 ounces. An adult human male weighing 175 pounds has a brain weighing about 3 pounds. The ratio brain-weight/total-weight of a human is about _______ times greater than that of a stegosaurus.

- Joe is reading a book that needed 795 digits to number the pages. If the book started on page 1, how many pages are there in the book Joe is reading?

- Algebra -
**Cassandra**, Thursday, December 6, 2012 at 10:23pmThe second one:

2+3+5+7+11+13+17+19+23+29+31+37+41+43+47+53+59+61+67+71+73=712

Matt

The fourth one:

2-9=8 digits

10-99=178 digits

100-200=300 digits

201-300=297 digits

301=3 digits

302=3 digits

303=3 digits

304= 3 digits

8+178+300+297+12= 795

304 pages

- Algebra -
**Randy**, Friday, December 7, 2012 at 1:08amI am confused, why did you not count the page one? Can you explain?

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