'X' आणि 'Y' दोन प्रकारच्या डाळी अनुक्रमे 100 रुपये आणि 150 रुपये प्रति किलोच्या किमती असलेल्या 7 ∶ 20 या प्रमाणात मिसळल्या तर या डाळीच्या मिश्रणाची किंमत (रुपयामध्ये) किती असेल (जवळच्या रुपयाच्या बरोबर)?

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SSC CGL 2023 Tier-I Official Paper (Held On: 18 Jul 2023 Shift 2)
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  1. 137
  2. 135
  3. 134
  4. 136

Answer (Detailed Solution Below)

Option 1 : 137
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Detailed Solution

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दिलेले आहे:

X प्रकारच्या डाळीची किंमत = 100 रुपये/किलो

Y प्रकारच्या डाळीची किंमत = 150 रुपये/किलो

X प्रकारच्या डाळीचे प्रमाण : Y प्रकारच्या डाळीचे प्रमाण = 7 : 20

वापरलेले सूत्र :

सरासरी किंमत = (दोन प्रकारच्या डाळीच्या मिश्रणाची एकूण किंमत)/एकूण प्रमाण

गणना :

समजा X प्रकारच्या डाळीचे प्रमाण = 7x आहे

X प्रकारच्या डाळीचे प्रमाण = 20x

सरासरी किंमत = (दोन प्रकारच्या डाळीच्या मिश्रणाची एकूण किंमत)/एकूण प्रमाण

⇒ {(100 × 7x) + (150 × 20x)}/27x

⇒ (700x + 3000x)/27x

 3700x/27x = 137.03 रुपये ≈ 137 रुपये

∴ योग्य उत्तर 137 रुपये आहे.

Shortcut Trick

F2 State G Arbaz 5-3-24 D1

\(\frac{150-m}{m-100}= \frac{7}{20}\)

⇒ 3000 - 20m = 7m - 700

⇒ 3700 = 27m

⇒ m = 3700/27 

 ⇒ m =137.03 रुपये ≈ 137 रुपये

∴ 137 रुपये हे योग्य उत्तर आहे.

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