Posted by **Jab** on Thursday, October 6, 2011 at 7:06pm.

2. PYRAMIDS When climbing an ancient

Mayan pyramid, the Johnson family

noticed that the bottom of each side of the pyramid started with 50 large

stones. The next step up had 45 large

stones, the next step up had 40 stones, and so on. Write an equation to represent the number of stones on each level. How many levels can the pyramid

have?

Steps 1 = 45 stones

Steps 2 = 40 stones

Steps 3 = 34

?

- Grade 9 Algebra Question 2 -
**Reiny**, Thursday, October 6, 2011 at 7:14pm
Do you have a typo for steps 3= 34 , should it be 35?

level 0 = 50

level 1 = 45

level 2 = 40

...

level n = -5n + 50

so if level n = 0

-5n+50=0

-5n=-50

n=10

counting ground level (level 0) there would be 11 levels

- Grade 9 Algebra Question 2 -
**Jab**, Thursday, October 6, 2011 at 7:29pm
yes its a typo! 35

- Grade 9 Algebra Question 2 -
**Jab**, Thursday, October 6, 2011 at 7:31pm
I like how you explain it. I now understand. Thanks Reiny!

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