Adding 20 to the square root of which number gives the square of 5?

A 16

B 25

C 9

D 125

Solution

Correct Answer: Option B

ধরি ,সংখ্যাটি x
শর্ত মতে , √x+২০=(৫)²
                বা  √x=২৫-২০
                  বা  √x=৫
                    বা x=৫²
                 ∴  x=২৫

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