In a recent survey 40 houses contained two or more people Of those houses containing only one person...........

Quantitative Aptitude ( CCS) Percentage

In a recent survey 40% houses contained two or more people. Of those houses containing only one person 25% were having only a male. What is the percent age of all houses which contain exactly one female and no males?

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Explanation:

Out of all 100% of houses, 40% contained two or more people. That means you are left with 60% of all houses that have only one person. 100% - 40% = 60%.
25% of that 60% are males. that means 75% of that 60% are females. This is where you multiply.
75% x 60% = 45%
Out of all houses, 45% have one female and no one else.