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All but 2 wore white. All but 2 wore yellow. All but 2 wore red. How many total?

THis is a question on my 4th grade grandson's homework.
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2 Answers

Hey Linda -- that's quite a riddle for 4th grade! Rewriting in "recipe" form looks like ...
 
All = W plus 2
All = Y plus 2
All = R plus 2 ... totaling both sides of the recipe ...  
 
3 "All's" = (W plus Y plus R) plus 6 = "All" plus 6 ... deduct an "All" set from each side ...
 
2 "All" groups contain 6 ... each "All" set must total 3 elements ... Regards, ma'am :)
1 white + 1 yellow + 1 red = 3 total