Others Maths Puzzle

(3x,x+y)=(6,3) find x and y ?

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Others Other Question

Two pipes P and Q fills a tank in 30 and 60 min. a person starts that at 5am to fill. he comes when it may fill but he saw that pipe R was also opened which empties that tank. Then he closes R. Now 20 min takes to fill the tank. What time R takes to empty the tank? A cloth merchanr sells a piece of cloth at a loss of 10%, but he gains 15% by using false weights. find how many meters of cloth did he sell?