In: Statistics and Probability
Mr. Smith had four daughters, each daughter have four brothers how many Kids did Mr. Smith have?
Since Mr. Smith had 4 daughters, so the total number of kids until now = 4.
Now each daughter had four brothers, which means Mr. Smith had 4 sons too so that each of his daughters had 4 brothers.
So, the total kids Mr. Smith had = 4 daughters+4 sons = 8 kids.
Note: Don't get confused by each daughter having 4 brothers to answer = 4×4 = 16 sons. If you calculate no of sons taking one daughter at a time, you will end up calculating 16 sons, which is wrong because in that case, each daughter would have 16 brothers (brothers of sister are also brothers), which is clearly wrong because each daughter had only 4 brothers.
So, the total number of sons Mr. Smith had = 4.
Total no of kids = 8.