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Faman39

  • 4 years ago

Its really hard for me to solve prob workin bakwards. i dnt get these math how to solve, pls teach me how these r can solve, if dnt i wont able to pass math exam, which i i hav to give within few days. On Monday morning, Colin filled his car with gallons of gas, then used gallons driving. On Tuesday, he used up 2 gallons driving. On Tuesday night, his gas tank had gallons remaining. How much gas was in Colin's tank before he filled up on Monday morning?

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  1. anonymous
    • 4 years ago
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    another copy and paste fail

  2. Faman39
    • 4 years ago
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    sorry ! i will do it now correctly

  3. Faman39
    • 4 years ago
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    On Monday morning, Colin filled his car with 6 1/2 gallons of gas, then used 3 1/4 gallons driving. On Tuesday, he used up 2 gallons driving. On Tuesday night, his gas tank had 4 1/4 gallons remaining. How much gas was in Colin's tank before he filled up on Monday morning?

  4. Faman39
    • 4 years ago
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    this is it

  5. anonymous
    • 4 years ago
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    i am going to guess 3

  6. anonymous
    • 4 years ago
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    lets say he started with "x" gallons of gas, then added 6 1/2 so now he has \[x+6\tfrac{1}{2}\] gallons in the car he then uses \[5\tfrac{1}{4}\] so he has \[x+6\tfrac{1}{2}-5\tfrac{1}{4}\] in the car

  7. anonymous
    • 4 years ago
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    and you know that this is equal to \[4\tfrac{1}{4}\] so put \[x+6\tfrac{1}{2}-5\tfrac{1}{4}=4\tfrac{1}{4}\]and solve for x

  8. anonymous
    • 4 years ago
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    \[x+6\tfrac{1}{2}=4\tfrac{1}{4}+5\tfrac{1}{4}=9\tfrac{1}{2}\] \[x=9\tfrac{1}{2}-6\tfrac{1}{2}=3\]

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