exam Maths Puzzle Numerical Ability

This is not from a textbook. I do not understand the AND / OR in the following equations:

4x-6_>2 AND 5x-4>21 _> is less than or equal to

2-4x<6 OR 3-x>9

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exam Other Question

Linda has $1.85 in quarters, nickels, and dimes. If she has three times as many dimes as quarters, and five fewer nickels than dimes, how many of each coin does she have? the shortest distance from the centre of a circle to a chord is 5 cm. find teh radius (2d.p.) of the circle if the chord is 3*2 times longer than the radius.