A household of three humans has cats and dogs in the ratio 1 : 2. If the total number of legs in the household is 42, what is the total number of cats in the household?
Answer & explanation
Correct answer: option 4
3 humans,
Cats : Dogs = 1 : 2
⇒ Humans have 2 legs, cats and dogs have 4 legs each, therefore,
⇒ 3(2) + a(4) + 2a(4) = 42
⇒ 6 + 4a + 8a = 42
⇒ 12a = 42 - 6
⇒ 12a = 36
⇒ a = 3,
Therefore there are = 1 x 3 = 3 cats.