A shopkeeper sold two articles. He sold one article at Rs.3175 and got 27% profit. He sold the other article at Rs.385 and got 23% loss. what is his overall gain or loss percent (correct to the nearest integer)?
Tap P can fill a cistern in 6 hours and tap Q can empty the full cistern in 10 hours. If both taps P and Q are kept open simultaneously, then in how many hours will the empty cistern be completely full ?