ABC26GN1357 · Square Roots and Cube Roots

Subject: General Aptitude · Chapter: Square Roots and Cube Roots · Exam: · Marks: · Difficulty:

While solving a mathematical problem, Samidha

(a)0.00021

(b)0.0021 squared a number and then subtracted 25 from it

(c)0.021

(d)0.21 rather than the required i.e., first subtracting 25 from

Answer

Answer (as printed): A

Explanation

Let the given number be x. Then, x2 – 25 = (x – 25)2 ⇔ x2 – 25 = x2 + 625 – 50x ⇔ 50x = 650 ⇔ x = 13.

Explanation as extracted from the printed page; notation may be imperfect.

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