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PSAT/SAT math? /:

DorkyelmoDorkyelmo Registered User Posts: 1,770 Senior Member
edited July 2011 in SAT Preparation
15)
A bottle containing "c" ounces of juice can be emptied to fill "g" identical glasses. How many such bottles would be needed to fill "n" of these glasses with juice?

A) gn/c
B) cn/g
C) g/n
D) n/g
E) c/n

The answer is D. But I don't get it.
Can anyone explain it? :)
Thanks!
Post edited by Dorkyelmo on

Replies to: PSAT/SAT math? /:

  • nothingtonothingto Registered User Posts: 1,347 Senior Member
    For these types of questions, re-make them.

    "A bottle containing "5" ounces of juice can be emptied to fill "10" indentical glasses. How many such bottles would be needed to fill "20" of these glasses with juice?"

    A) 10(20)/5 = 200/5 = 40

    B) 5(20)/10 = 100/10 = 10

    C) 10/20 = 1/2

    D) 20/10 = 2

    E) 5/20 = 1/5

    You would need 2 bottles to fill 1 glass of juice.

    n(5) * 2 = 10 (g)

    So only D makes sense.

    Substitution makes these questions seem much less intimidating.
  • DorkyelmoDorkyelmo Registered User Posts: 1,770 Senior Member
    OH.
    Thanks. :D
This discussion has been closed.