SSC CGL Tier-II practice question
The difference between the value of a number increased by 10% and the value of the same number decreased by 25% is 231. What is the number?
From a SSC CGL Tier-II Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 660
Let the number be x. (100 + 10)% of x − (100 − 25)% of x = (10 + 25)% of x = 35% of x = 231. So x = 231 × 100/35 = 660. (Subtracting the percentages, 10% − 25%, is the wrong move — the two changes are on opposite sides of x, so they add.)
हिंदी में प्रश्न
एक संख्या को 10% बढ़ाने पर प्राप्त मान और उसी संख्या को 25% घटाने पर प्राप्त मान का अंतर 231 है। वह संख्या क्या है?
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सही उत्तर: (B) 660
माना संख्या x है। x का (100 + 10)% − x का (100 − 25)% = x का (10 + 25)% = x का 35% = 231। अतः x = 231 × 100/35 = 660। (प्रतिशतों को घटाना, 10% − 25%, गलत है — दोनों परिवर्तन x के विपरीत ओर हैं, इसलिए वे जुड़ते हैं।)
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