Match List - I with List - II :List - I List - II A. In a class, the ratio of number of male students to number of female students is 9 : 11. The percentage (%) of female students in the class is ____ I. 4 B. When a number 'x' is added to the numerator and denominator of fraction 7/11, it becomes 2/3, then x is ____ II. 2 C. Two numbers are directly proportional to each other. If the value of one of the number is doubled, then their product will become ____ times III. 55 D. If x : y = 3 : 2, then (xy + y²)/(x² − y²) is equal to ____ IV. 1
Choose the correct answer from the options given below :सूची - I को सूची - II से सुमेलित कीजिए :सूची - I सूची - II A. किसी कक्षा में छात्रों और छात्राओं की संख्या का अनुपात 9 : 11 है। कक्षा में छात्राओं का प्रतिशत (%) है ____ I. 4 B. जब भिन्न 7/11 के अंश और हर में कोई संख्या 'x' जोड़ी जाती है तो वह 2/3 हो जाती है, तब x है ____ II. 2 C. दो संख्याएँ परस्पर अनुक्रमानुपाती हैं। यदि उनमें से एक संख्या का मान दोगुना कर दिया जाए, तो उनका गुणनफल ____ गुना हो जाएगा III. 55 D. यदि x : y = 3 : 2, तो (xy + y²)/(x² − y²) बराबर है ____ IV. 1
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Correct answer: C. A-III, B-IV, C-I, D-II
Explanation
A: females = 11 parts out of 9 + 11 = 20 parts, so 11/20 × 100 = 55% (A-III). B: (7 + x)/(11 + x) = 2/3 gives 21 + 3x = 22 + 2x, so x = 1 (B-IV). C: if y ∝ x, doubling x also doubles y, so the product xy becomes 2 × 2 = 4 times (C-I). D: with x : y = 3 : 2, (xy + y²)/(x² − y²) = y(x + y)/[(x + y)(x − y)] = y/(x − y) = 2/(3 − 2) = 2 (D-II). Hence A-III, B-IV, C-I, D-II.A: छात्राएँ 9 + 11 = 20 भागों में से 11 भाग, अतः 11/20 × 100 = 55% (A-III)। B: (7 + x)/(11 + x) = 2/3 से 21 + 3x = 22 + 2x, अतः x = 1 (B-IV)। C: यदि y ∝ x, तो x दोगुना करने पर y भी दोगुना होता है, अतः गुणनफल xy 2 × 2 = 4 गुना हो जाता है (C-I)। D: x : y = 3 : 2 पर, (xy + y²)/(x² − y²) = y(x + y)/[(x + y)(x − y)] = y/(x − y) = 2/(3 − 2) = 2 (D-II)। अतः A-III, B-IV, C-I, D-II।More Mathematical Reasoning and Aptitude questions
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