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rambo2210

  • 2 years ago

If r = 5 z then 15 z = 3 y, then r = (A) y (B) 2 y (C) 5 y (D) 10 y

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  1. nphuongsun93
    • 2 years ago
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    r = 5z ?r = 15z ?r = 15z = 3y

  2. rambo2210
    • 2 years ago
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    please explain.

  3. rambo2210
    • 2 years ago
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    @frx can you please solve this?

  4. frx
    • 2 years ago
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    One min..

  5. frx
    • 2 years ago
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    It's A. let me explain

  6. frx
    • 2 years ago
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    You got \[r=5z; 15 z=3y\]

  7. frx
    • 2 years ago
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    So what you wanna find is what r is in terms of y

  8. frx
    • 2 years ago
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    r=5z and 15z=3y so the conclution from that is that 5z is 1/3 of 15z, right?

  9. frx
    • 2 years ago
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    That means that r=5z=y

  10. rambo2210
    • 2 years ago
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    so final answer is "A"?

  11. frx
    • 2 years ago
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    Another formulation: you know that 15z=3y and you want to find 5z

  12. frx
    • 2 years ago
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    Exactly

  13. frx
    • 2 years ago
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    Do you get it? :)

  14. frx
    • 2 years ago
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    You can also set it as an equationsystem

  15. rambo2210
    • 2 years ago
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    yeap got it. thank you.

  16. frx
    • 2 years ago
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    np

  17. frx
    • 2 years ago
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    \[r=5z \] \[z=\frac{r}{ 5 }\] \[15z=3y\] \[15\frac{ r }{5 }=3y\] \[3r=3y\] \[r=y\]

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