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the age of two people in ratio is 6:5, if the sum of their ages is 44.after how many years would the ratio be 8:7

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if the difference of two number is 9 and product of two number is 10, what is the square of the sum of numbers in a particular city, buildings under residential category was numbered as 1 to 100. shops were numbered between 150 to 200(only prime numbers). how many times does the number 6 appear?