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
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We can let the number of cats sold in March = c and the number of dogs sold in March = 2c

Thus the number of dogs sold in April = 4c and the number of cats sold in April = 3c.

We can now create the equation:

c + 2c + 4c + 3c = 500

10c = 500

c = 50

Thus, 2c = 100 dogs were sold in March.

Answer: B
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