GMAT Math Practice Test #1

Answer A

Do not add 25 and 25. Think how to take some figures out of square root symbol. You notice 25 can be taken common

√(25+25 ) =√(25)(1+1 ) = 5√(1+1 ) = 5√2

Key takeaway: You are not expected to know the square root of the numbers like 50 So look for a way to attack such problems other way than straight arithmetic calculation. You should be able to find some factors or application of simple algebraic formulae.