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(5x + 7) 2 + (5x – 7) 2 = 25x 2 + 49 + 70x + 25x 2 + 49 – 70x
= 50x 2 + 98
= 2(25x 2 + 49)
The average cost of three chairs is Rs.10000. The average cost decrease by 10% when one more chair is included. What is the cost price of the 4th
The average of 75 percent of x and 48 percent of y is 90. What will be the average of 125 percent of x and 80 percent of y?
