8 of 10 Krutika is 11 years older than Gordon. Pip
is 12 years younger than Gordon. If the
total of their ages is 77, how old is the
youngest of them?

Skew lines(segments) are lines(segments) in 3 dimensions that do not intersect the given segment and are not parallel to it.  ae, bf, eg, and fh are your skew segments.  i hope that : )