In a. three story building 2/5 of the total residents are males and 1/4 are femals what fraction of the total residents are children?
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males residents=2/5
female residents=1/4
total of females and males=2×4+/5×4 + 1×5/4×5
=8/20+5/20= 13/20
children residents= 20/20-13/20=7/20
7/20 part of the building are childrens
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