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http://prntscr.com/mdzp8i

 Jan 29, 2019
 #1
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Let the number of strawberry sold = x

The number of vanilla =  strawberry + 2  =  x + 2

The number of chocolate =  vanilla + 11  =   (x + 2) + 11  =  x + 13

 

So we have that

 

x + ( x + 2) + ( x + 13)  = 42     simplify

 

3x + 15  = 42           subtract 15 from both sides

 

3x  =  27          divide both sides by 3

 

x = 9  =  strawberry sold

 

cool  cool cool

 Jan 29, 2019

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