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A survey of 71 families showed that: 40 have a son(s) 45 have a daughter(s) 18 had neither a son nor a daughter. How many families had ONLY son (s)?

 Apr 20, 2021
 #1
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eight have son only ......

 

 Apr 20, 2021
edited by ElectricPavlov  Apr 20, 2021

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