exam Maths Puzzle Numerical Ability

Anna has 12 bills in her wallet, some 5$ and some $10. The total value of the bills is $100. How many of each bill does Anna have?

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exam Other Question

I do not understand how I turn the square root of (24/25) into (2/5*square root of 6). A quadratic function has no x-intercepts. What is a possible value of the diacriminant of the function? I think it is -2??