pushpitkc wrote:

Of the 90 houses in a certain community, 60 have a garden. How many houses have a lobby?

1. 50 houses in the community have a garden but do not have a lobby.

2. The number of houses in the community that have both a garden and a lobby is equal to the number of houses that have neither.

Source :

Experts GlobalHi..

Let's see the statements

1. 50 houses in the community have a garden but do not have a lobby.

60 had garden and 50 have only garden so 10 have both but nothing more.

Insufficient

2. The number of houses in the community that have both a garden and a lobby is equal to the number of houses that have neither.

\(L_{only}+G_{only}+both+neither=90\)

Let both=x=neither...

We are looking for L_only+x...

So \(L_{only}+G_o+B+n=L_o+60+x=90......L_o+x=30\)

So Answer 30

Sufficient

B

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372

2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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