I am interested to know not IF you can solve the following problem, but HOW you solve it:
A large tap fills a bath in 14 minutes; a smaller tap fills the same bath in 35 minutes. If both taps are running how long does it take to fill the bath?
"And once you understand something ... I mean deeply understand something, like a mathematician, you don't have to memorize anything." @jamestantonbit.ly/2wCSNwp