exam Maths Puzzle Numerical Ability

1. 3 square root of 135

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Hello,

I need help with this:

If y varies directly as x and y = 25 when x = 10, find y when x = 4.

Thank you The score on the entrance test for a well known law school has a mean score of 200 points and a standard deviation of 50 points. At value should the lowest passing score be set if the school wishes only 2.5% of those taking the entrance test to pass?