general Maths Puzzle

If 50% of (x-y)=30% of (x+y), then what percent of x is y ?

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general Other Question

Three boys A,B and C were asked to work out 180 problems. A could do 9 out of 10 correctly,B 13 out of 15 correctly and C 5 out of 6 correctly. What is the least number that that were done right by all the three ? RAM AND SHYAM USED TO PLAY WITH COINS.CONSIDER THE SITUATION:
RAM has one more coin than player SHYAM. Both throw all of their coins simultaneously and observe the number that come up heads. Assuming all the coins are fair, what is the probability that RAM obtains more heads than SHYAM?