exam Maths Puzzle Numerical Ability

find:

4square root of 3 - 8/sqr root of 2 + 5/ square root of 3

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a train leaves a station and travels east at 72km/h. three hours later a second train leaves on a parallel track and travels at 120km/h. When will the second train overtake the first train? My son has statements that he needs to write the inequality using symbols for each statement. thanks in advance

If -2 is added to one-half of a number, the sum is less than 4. So far we have -2 + 1/2n??? Please advise