exam Maths Puzzle Numerical Ability

A wallet contains $5 bills and $10 bills. There are 15 bills in the wallet with a total value of $120. Determine the number of $5bills and the number of $10 bills in the wallet.

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HI can you help me with this problem?
my triangle on the problem is a right triangle and has an hypotenuseof 16 and an adjacent of 73 degrees what is x equal to on the opposing side adjacent to 73 degrees? Please respond. solving inequalities: x - 9 > -3