In a house, there are 4 birds, 3 dogs, and 18 cats living with the human family. If the total number of feet in the house are 74 more than the number of heads in the house, how many family members are there?	Choices.
A) 1  B) 3  C) 5  D) 7  E) 9

Rationale: explanation : let number of family members be x . then , total number of feet = 2 x 4 + 4 x 3 + 4 x 18 + 2 x = 2 x + 92 . total number of heads = 4 + 3 + 18 + x = 25 + x . therefore ( 2 x + 92 ) = ( 25 + x ) + 74 or x = 7 . answer : d
Answer: D