Question 136

if $$78^{2}$$ is subtracted from the square of a number, the obtained answer is 6460. What is that number?

Solution

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Let the number be $$x$$

According to ques,

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

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

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

=> Ans - (E)

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