सविस्तर स्पष्टीकरण (Detailed Explanation):
अचूक उत्तर: पर्याय (1)
दिलेल्याप्रमाणे:
5, 2, आणि 1 मूल्याच्या नाण्यांचे प्रमाण = 4 : 3 : 2
बॉक्समधील एकूण रक्कम = 280
5 एकक नाण्याचे मूल्य = 5
2 एकक नाण्याचे मूल्य = 2
1 एकक नाण्याचे मूल्य = 1
वापरलेले सूत्र:
एकूण रक्कम = (5 एकक नाण्यांची संख्या × 5) + (2 एकक नाण्यांची संख्या × 2) + (1 एकक नाण्यांची संख्या × 1)
समजा 5-एकक , 2-एकक आणि 1-एकक नाण्यांची संख्या अनुक्रमे 4x, 3x आणि 2x आहे.
गणना:
⇒ एकूण रक्कम = (4x × 5) + (3x × 2) + (2x × 1)
⇒ 280 = 20x + 6x + 2x
⇒ 280 = 28x
⇒ x = 280 / 28
⇒ x = 10
⇒ 5-एकक नाण्यांची संख्या = 4x = 4 × 10 = 40
⇒ 2-एकक नाण्यांची संख्या = 3x = 3 × 10 = 30
⇒ 1-एकक नाण्यांची संख्या = 2x = 2 × 10 = 20
∴ योग्य उत्तर 40, 30, 20 आहे.
Shortcut Trick
Multiply the ratio parts by their respective denominations to find the value parts.
Value Ratio = (4 × 5) : (3 × 2) : (2 × 1) = 20 : 6 : 2.
Sum of value parts = 20 + 6 + 2 = 28 units.
28 units = 280 ⇒ 1 unit = 10.
Number of coins = (4 × 10), (3 × 10), (2 × 10) = 40, 30, 20.
∴ The correct answer is 40, 30, 20.
Alternate Method
Given:
Denominations of coins = ₹5, ₹2, and ₹1
Ratio of number of coins = 4 : 3 : 2
Total value in the box = ₹280
Formula Used:
Total Value = (Value of Coin_(1) × Number of Coin_(1)) + (Value of Coin_(2) × Number of Coin_(2)) + ...
Calculations:
Let the number of ₹5, ₹2, and ₹1 coins be 4x, 3x, and 2x respectively.
⇒ Value of ₹5 coins = 5 × 4x = 20x
⇒ Value of ₹2 coins = 2 × 3x = 6x
⇒ Value of ₹1 coins = 1 × 2x = 2x
⇒ Total Value = 20x + 6x + 2x = 280
⇒ 28x = 280
⇒ x = 280 ÷ 28
⇒ x = 10
⇒ Number of ₹5 coins = 4 × 10 = 40
⇒ Number of ₹2 coins = 3 × 10 = 30
⇒ Number of ₹1 coins = 2 × 10 = 20
∴ The correct answer is 40, 30, 20.
Related Concepts:
Ratio of Coin Values
If the values of denominations are in ratio a : b : c, the number of coins is (Value Part ÷ Face Value).
Unitary Method in Ratios
Always find the value of one 'unit' or 'x' by dividing the actual total by the sum of ratio parts.
Currency Conversion
If denominations are in paise, convert them to rupees by dividing by 100 before equating to the total (1 Rupee = 100 Paise).
स्पष्टीकरण आकृती (Solution Visual Diagram):
Solution Diagram