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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?

 Mar 28, 2024
 #1
avatar+128794 
+1

Laverne says  2  7   12   17

 

Sum

2  9  21

 

12 is the number

 

cool cool cool

 Mar 28, 2024

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