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# A certain pet store sells only dogs and cats. In March, the

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A certain pet store sells only dogs and cats. In March, the [#permalink]  24 May 2017, 01:44
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A certain pet store sells only dogs and cats. In March, the store sold twice as many dogs as cats. In April, the store sold twice the number of dogs that it sold in March, and three times the number of cats that it sold in March. If the total number of pets the store sold in March and April combined was 500, how many dogs
did the store sell in March?

A) 80

B) 100

C) 120

D) 160

E) 180
[Reveal] Spoiler: OA

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Re: A certain pet store sells only dogs and cats. In March, the [#permalink]  10 Oct 2017, 09:03
So, in March the store has sold twice as dogs as cats, i.e. D = 2C and C cats.

In April, the store has sold double the dogs of March, i.e. 2D = 4C and triple of cats as in March, 3C.

Now we know that the sum of all sold animals is 500 = 2C + C + 4C + 3C = 10C. Thus, C = 50 and thus the number of dogs sold in March is equal to 2C = 2*50 = 100. Answer B
Re: A certain pet store sells only dogs and cats. In March, the   [#permalink] 10 Oct 2017, 09:03
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