In a herd of cows, the number of legs are 14 more than twice the number of heads. The number of cows in the herd is
(a)5
(b)7
(c)10
(d)12
Answer
Answer (as printed): B
Explanation
Let the number of cows in the herd be $x$. Then, number of legs $=4 x$; number of heads $=x$. $$\therefore \quad 4 x-2 x=14 \quad \text { or } \quad 2 x=14 \quad \text { or } \quad x=7 .$$
Explanation as extracted from the printed page; notation may be imperfect.