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how to practice approximation 

is anyone of you giving testbook or oliveboard tests ????i found them too difficult as compared to cracku ..i get mostly 85 percentile in cracku test but its difficult to even get 40 in textbook 

A and B can do a piece of work in x days. If B increases its efficiency by 20% the work can be completed in 2 days less. if A alone can do a work in 30 days den B can complete the whole work in??????
solution plz

Where I get coupon number to enroll in test

what would i do to score max in eng section 

sbi po mocks in latest pattern

Q.99 , Probability , how result came to 95/663, 2 cards are taken from a pack of 52 cards , what is probability that none of these cards are black or face cards ???? Plz reply

2 vessels contain a mixture of milk and water in the ratio 8:3 & 5:1 respectively.35 liters cask is filled with these vessels so as to make milk & water ratio 4:1.what % of total quantity from first vessel?

this time how many puzzles can be  asked in sbi po prelims. reasoning section...what r the chances??

What is the minimum time in which the puzzles from reasoning section should be solved??