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Of the balloons recently sold by a party store, 2 were blue and 10 were other colors. Considering this data, how many of the next 18 balloons sold would you expect in be blue

 Jul 7, 2023
 #1
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the answer is 3

 Jul 7, 2023
 #2
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Of the balloons recently sold by a party store, 2 were blue and 10 were other colors. Considering this data, how many of the next 18 balloons sold would you expect in be blue   

 

Assuming a consistent proportion, x is to 18 as 2 is to 10    

 

                                                         x          2     

                                                       –––  =  –––     

                                                        18        10                

 

cross multiply                                  10x  =  36              

 

                                                           x  =  3.6      

 

You can't have point six of a balloon,   

so round this to a whole number, one   

way or the other.  Convention would    

be to round up.     

.

 Jul 7, 2023
 #3
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Your answer is wrong.

Guest Jul 10, 2023
 #4
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That's right, because I clumsily misread the problem. 

It would have been nice if you'd said how it was wrong. 

 

I should have said x is to 18 as 2 is to 12    

(should have included the blue ones in the known ratio)   

 

                                                         x          2     

                                                       –––  =  –––     

                                                        18        12               

 

cross multiply                                  12x  =  36              

 

                                                           x  =  3     

 

.

Bosco  Jul 12, 2023

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