If selling an article for ₹820 causes 10% loss on the selling price, then find its cost price. 8) If x % of 600 is 450, then find the value of x. 9) Simplify (3x+5y)(3x-5y) by using (a+b) (a−b) identity. 10) The sum of two numbers is 36 and one number exceeds another by 8. Find the numbers. 11) Solve 2x+5 = 9 12) Represent the following data in ungrouped frequency table which gives the number of children in 25 families.1, 3, 0, 2, 5, 2, 3, 4, 1, 0, 5, 4, 3, 1, 3, 2, 5, 2, 1, 1, 2, 6, 2, 1, 4 13) Form a continuous frequency distribution table for the marks obtained by 30 students in a X std public examination.328, 470, 405, 375, 298, 326, 276, 362, 410, 255, 391, 370, 455, 229, 300, 183, 283, 366, 400,495, 215, 157, 374, 306, 280, 409, 321, 269, 398, 200. *
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