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Laverne starts counting out loud by ${}5$'s.  She starts with $2$.  As Laverne counts, Shirley sums the numbers Laverne says.  When the sum finally exceeds $20,$ Shirley runs screaming from the room.  What number does Laverne say that sends Shirley screaming and running?

 May 28, 2024
 #1
avatar+1332 
+1

We can easily just graph out the numbers since there are not a lot of terms we have to go through.  

 

Laverne

Shirley   
2 2
7 9
12 21

 

This means when Laverne says 12, Shirley goes off running!

 

Thanks! :)

 May 29, 2024

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