exam Maths Puzzle Numerical Ability

Warren has 40 coins; nickels dimes and quarters worth $4.05. He has seven more nickels than dimes. How many quarters does he have?

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exam Other Question

Does every infinite set has the same cardinality (number of elements). Hello, could someone help me on these problems please? Thank you for your help.

Find the zeros of the function algebraically.
problem #21: f(x)=4x^3-24x^2-x+6
problem #22: f(x)=9x^4-25x^2