ABC26GN0768 · Decimal Fractions

Subject: General Aptitude · Chapter: Decimal Fractions · Exam: · Marks: · Difficulty:

$(7.5 \times 7.5+37.5+2.5 \times 2.5)$ is equal to
(a)30
(b)60
(c)80
(d)100
Answer
Answer (as printed): D
Explanation
Given expression = (7.5 × 7.5 + 2 × 7.5 × 2.5 + 2.5 × 2.5) = (a2 + 2ab + b2) = (a + b)2 = (7.5 + 2.5)2 = 102 = 100.

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

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