Of \(60\) children, \(30\) are happy, \(10\) are sad, and \(20\) are neither happy nor sad. There are \(20\) boys and

[Vincen]

Of \(60\) children, \(30\) are happy, \(10\) are sad, and \(20\) are neither happy nor sad. There are \(20\) boys and \(40\) girls. If there are \(6\) happy boys and \(4\) sad girls, how many boys are neither happy nor sad?

(A) 2
(B) 4
(C) 6
(D) 8
(E) 10

Answer: D

Source: Manhattan GMAT