another data sufficiency question

At a certain pet shop, 1/3 of pets are dogs & 1/5 of pets are birds. How many of the pets are dogs?

1) There are 30 birds at the pet shop
2) there are 20 more dogs then birds at the pet shop.

How do i solve with the 2nd information given by itself. Please explain.

data sufficiency problem

data sufficiency question

In the figure above, if x & y are each less than 90 and PS // QR, is the length of segment PQ less than the length of segment SR?

Please explain step by step and some rules I should know.

what happened to the 5^21?

pratice exams

Hello, I've been studying for the math and verbal for the gmat using OG, critical reasoning bible, and Manhatten Review (math and verbal). I would like to start taking a real type exam like how they would give to you when you take the gmat. Please advise where i can find or purchase some pratice tes...

any other good book for CR? Please give me input

kaplan gmat verbal workbk SC

As genetics researchers achieve greater success in their attempt to map the exact locations and functions of human genes, the close connection between genes and birth defects has become increasingly clear. a. close connection between genes and birth defect has become b. closeness of the connection b...

sentence correction

Added to worries about budget cuts and costs of living increases, the administrators of public health care facilities mush contend with the possibility of a strike by employees. A) Added to worries about budget cuts and cost of living increases B) Added to budget cuts and increases in the cost of li...