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At a particular zoo, 2/5 of all the animals are mammals,

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At a particular zoo, 2/5 of all the animals are mammals, [#permalink] New post   24 Feb 2020, 11:10
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At a particular zoo, \(\frac{2}{5}\) of all the animals are mammals, and \(\frac{2}{3}\) of the mammals are allowed to interact directly with the public. If 24 mammals are allowed to interact directly with the public, how many animals in this zoo are NOT mammals?

A. 36

B. 48

C. 54

D. 60

E. 72

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Re: At a particular zoo, 2/5 of all the animals are mammals, [#permalink] New post   25 Feb 2020, 09:11
1
Let total be x.
(2/5 * 2/3)of x = 24
x= (24*15)/4
=90.
Not mammals are 3/5 of 90 = 54.
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Re: At a particular zoo, 2/5 of all the animals are mammals, [#permalink]
25 Feb 2020, 09:11
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