exam Maths Puzzle Numerical Ability

c/2z + d/3z

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I really need help with these problems if any tutor can help please do i have been waiting for a few hours now i'm reposting them thanks to anyone who helps.

1) F(x)= 4x^4+8x^3- 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.