exam Maths Puzzle Numerical Ability

please help to simplify

3 time the square root of 3/7 - 2 times the square root of 7/3 - the square root of 189

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exam Other Question

If you flip a coin 10 times, what is the probability of getting at least 4 heads? 2 planes leave Chicago-one traveling due east and the other due west. The first travels 100miles per hour faster than the second. How long will it be until they are 2000 miles apart