Question 136

If $$(78)^{2}$$ is subtracted from the square of the number, the answer so obtained is 6,460. What is the number ?

Solution
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Let the number be $$x$$

Acc to ques,

=> $$x^2 - 78^2 = 6460$$

=> $$x^2 = 6460 + 6084$$

=> $$x = \sqrt{12544} = 112$$

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