If x:y=5:3, then (8x-5y): (8x-5y)=?

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There are n students in a school . If r% among the students are 12 years or younger, which of the following expressions represents the number of students who are solder than 12?

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125 gallins of a mixture contains 20% water , What amount of additional water should be added such that water content be raised to 25% ?

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The sum of squares of two numbers is 80 and the square of difference between the two numbers is 36. Find the product of tow numbers.

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A student loses I mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?

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There are two stations of length 162 meters and 120 meters respectively . A train takes 15 seconds to pass first station and 18 seconds to pass another station . Determine the length of the train ?

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