exam Maths Puzzle Numerical Ability

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?

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exam Other Question

The boundary line for the linear inequality has been graphed. Determine the correct half-plane and complete the graph.

y is greater than 3
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