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?
YIKES please help me with this one.

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exam Other Question

Simplify the expression. Write answer with positive exponents. Assume that all variabls reperesent positive real numbers.
(-27x^9)^1/3 find an equation in the form y=mx+b
through (-7,4), perpendicular to y=8