exam Maths Puzzle Numerical Ability

Michael has $2.25 in nickels, dimes, and quarters. If he has 3 fewer dimes than quarters and as many nickels as the sum of the dimes and quarters, how many of each kind of coin does he have?

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Please help me solve this problem:

Determine whether each statement is sometimes, always, or never true.
√(3-1) is a real number for t ≥ 3? Solve the following system of linear inequalities by graphing.
x + 2y _< 3
2x - 3y_< 6