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k. Am asking you after trying the problem, which I couldn't solve. But I could solve problems related to the above question. So what are you thinking sir?

Q: A student instead of finding the value of 7/8th of a number, found the value of 7/18th of a number. If his answer differed from the actual one by 770. Find the number?
A. 1238
B. 1430
C. 1584...