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March 29, 2015

March 29, 2015

Posted by **Anonymous** on Tuesday, September 13, 2011 at 8:40pm.

The number of animal blocks in the first row is....

I can’t seem to find a pattern, having a hard time solving this problem too.

Also How do I find the total number of blocks used in the arrangement?

The answer somehow is 36, and the total number of blocks is 576. I dont know how to get this.

Im probably supposed to use one of these formulas... Sn = n[2a +(n-1)d]/2

Sn = n(a +tn)/2. Still I dont get how to do it

- Math Block Problem -
**bobpursley**, Tuesday, September 13, 2011 at 8:48pmthe difference between the ninth and fifth is 28, so that is between 4 rows, so the differnce between each row is 28/4=7

start with 9th and go down:

92

85

78

71

64

57

50

43

36 first row.

Sum them: Sn= 9(2*36+8*7)/2=9*(72+56)/2=

Sn=9*64=576

- Math Block Problem -
**Anonymous**, Tuesday, September 13, 2011 at 8:52pmThanks so much. I was so confused :)

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