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Flvs.net

  • one year ago

If 2 over 7 of a ton of concrete covers 7 over 8 of a wall, how many tons of concrete are required to cover the entire wall? A. 1/4 ton B. 16/49 ton C. 5/7 ton D. 65/56 tons

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  1. Flvs.net
    • one year ago
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    @jcoury

  2. DanJS
    • one year ago
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    \[\frac{ 1~wall }{ 1 }*\frac{ 2/7 ~ ton }{ 7/8~wall } = ~~~ton\]

  3. anonymous
    • one year ago
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    cross multiply

  4. DanJS
    • one year ago
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    no, just calculate

  5. Flvs.net
    • one year ago
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    How?

  6. DanJS
    • one year ago
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    oh, to divide a fraction by a fraction, flip the bottom one over and multiply them

  7. DanJS
    • one year ago
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    \[\frac{ 2/7 }{ 7/8 } = \frac{ 2 }{ 7 }*\frac{ 8 }{ 7 }\]

  8. Flvs.net
    • one year ago
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    So what do I do?

  9. DanJS
    • one year ago
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    multiply \[\frac{ 2/7 }{ 7/8 } = \frac{ 2 }{ 7 }*\frac{ 8 }{ 7 }=\frac{ 8*2 }{ 7*7 } = \]

  10. Flvs.net
    • one year ago
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    Huh?

  11. DanJS
    • one year ago
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    Dividing Fractions - \[\frac{ \frac{ a }{ b } }{ \frac{ c }{ d } } = \frac{ a }{ b }*\frac{ d }{ c }\]

  12. DanJS
    • one year ago
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    multiplying fractions - \[\frac{ a }{ b }*\frac{ c }{ d } = \frac{ a*c }{ b*d }\]

  13. DanJS
    • one year ago
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    so your final answer is (8*2) / (7*7) tons

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