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Two children named Peter and Wanda are playing a number game. If Peter

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Joined: 02 Sep 2009
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Two children named Peter and Wanda are playing a number game. If Peter  [#permalink]

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New post 31 Oct 2018, 23:57
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

73% (01:09) correct 28% (01:28) wrong based on 39 sessions

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Two children named Peter and Wanda are playing a number game. If Peter's number z is 200 percent of Wanda's number, what is 20 percent of Wanda's number, in terms of z?


A. 10z

B. 2z

C. z/5

D. z/10

E. z/20

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Re: Two children named Peter and Wanda are playing a number game. If Peter  [#permalink]

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New post 01 Nov 2018, 03:19
1
z = (200/100)*W , W being Wanda's number.
So, z = 2W or W = z/2
20% of W = (20/100)*(z/2) = z/10

Option D
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Re: Two children named Peter and Wanda are playing a number game. If Peter  [#permalink]

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New post 01 Nov 2018, 04:21

Solution


Given:
    • Peter’s number, z = 200% of Wanda’s number

To find:
    • 20% of Wanda’s number, in terms of z

Approach and Working:
    • z = (200/100) * Wanda’s number
      o Implies, Wanda’s number = \(\frac{z}{2}\)

    • 20% of \(\frac{z}{2} = (\frac{20}{100}) * (\frac{z}{2}) = \frac{z}{10}\)

Hence, the correct answer is Option D

Answer: D

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Re: Two children named Peter and Wanda are playing a number game. If Peter &nbs [#permalink] 01 Nov 2018, 04:21
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