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anonymous

  • 4 years ago

Explain please: the ratio of Mark's allowance to Jim's allowance is 3:7 The ratio of Mark's allowance to Wanda's allowance is 2:5. What is the ratio of Jim's allowance to Wanda's allowance?

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  1. phi
    • 4 years ago
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    you know M/J (it is 3/7) you know M/W (2/5) what is J/W ? one way to do this is "solve" for J and solve for W, then take the ratio

  2. phi
    • 4 years ago
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    if M/J= 3/7 then (flip both) J/M= 7/3 multiply both sides by M to get J= 7M/3 can you solve for W in M/W = 2/5 ?

  3. anonymous
    • 4 years ago
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    Yes, w = 2m/5

  4. phi
    • 4 years ago
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    it looks upside down to me

  5. anonymous
    • 4 years ago
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    Right, sorry. w = 5m/2

  6. phi
    • 4 years ago
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    now we do J/W \[ \frac{\frac{7m}{3}}{\frac{5m}{2}} \]

  7. anonymous
    • 4 years ago
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    so 7m/3:5m/2 7/3:5/2 7/3*2/5 14/15?

  8. phi
    • 4 years ago
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    instead of dividing by 5m/2, multiply by 2/5m

  9. phi
    • 4 years ago
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    yes, that looks good

  10. anonymous
    • 4 years ago
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    Okay thank you.

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