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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)
7 years ago, the ratio of the ages of A and B was 1:2 and after 7 years it will become 3:5. Find their present ages.
At present, Peter is Seven years younger than Adam. Adam’s age twenty years hence will be equal to thrice that of peter Five years ago. What will ...
Three years ago, 'B' was twice as old as 'A'. In three more years, 'B' will be 60% older than 'A'. What is 'A's current age?
Which of the following is a video format?
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