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Math Help - Maths

  1. #1
    Junior Member
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    Maths

    Hi,

    For each Australia dollar, Amy receives 80 United States cents, I.e $A1 = US80c. She wants $US600 for a trip, how much should she receive in Australian dollars?

    A)$480 B)$800 C)$750 (D)$720
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Maths

    For each Australian dollar, Amy receives 4/5 U.S. dollars. Letting x be the number of Australian dollars, we can multiply this by 4/5 and equate to 600 to find the number of Australian dollars that is equivalent to 600 U.S. dollars.

    \frac{4}{5}\cdot x=600

    Now solve for x.
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  3. #3
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    Re: Maths

    what the best way of finding X? guess? trial and error??
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  4. #4
    MHF Contributor MarkFL's Avatar
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    Re: Maths

    No, solve the equation. If you multiply both sides by 5/4, you will be left with x on the left, and on the right you have 5/4 times 600, which is the answer to the question.
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  5. #5
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    Re: Maths

    Thanks the only way i could figure out doing is multiplying A) B) C) D) until it gave me 600.
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