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What percent of the children in class K have been to London?

Expert replies
by swerve » Mon Oct 30, 2017 9:02 am
What percent of the children in class K have been to London?

(1) The number of boys in class K is equal to the number of girls in class K.

(2) Among the children of class K, the number of girls that have been to London is equal to the number of boys that have been to London.

The OA is E.

I don't understand this DS question. Please, can any expert explain it for me? Thanks.
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Source: — Data Sufficiency |