Latest exam Aptitude Question SOLUTION: I have to simplify this; sqrt20/5-1/sqrt5 I keep coming up with that this cannot be simplified, am I on the right track. my result is =15sqrt5/100 please help

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Previous Question: A bus leaves a station at 1 P.M., traveling west at an average rate of 44 mi/h. One hour later a second bus leaves the same station, traveling east at a rate of 48 mi/h. At what time will the two buses be 274 mi apart? Next Question: A chemist has 300 grams of 20% hydrochloric acid solution. He wishes to drain some off and replace it with an 80% solution so as to obtain a 25% solution. How many grams must be drain and replace it with 80% solution.

(#M40067311) EXAM Numerical Ability question Keep an EYE

I have to simplify this; sqrt20/5-1/sqrt5

I keep coming up with that this cannot be simplified, am I on the right track.
my result is
=15sqrt5/100
please help: Asked In exam (9 years ago); Unsolved; Is this Puzzle helpful? (0) (0) Submit Your Solution

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Previous Question: A bus leaves a station at 1 P.M., traveling west at an average rate of 44 mi/h. One hour later a second bus leaves the same station, traveling east at a rate of 48 mi/h. At what time will the two buses be 274 mi apart? Next Question: A chemist has 300 grams of 20% hydrochloric acid solution. He wishes to drain some off and replace it with an 80% solution so as to obtain a 25% solution. How many grams must be drain and replace it with 80% solution.

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