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Find the value of if 3 : x :: 12 : 20. Find the value of x?
  1. 4
  2. 5
  3. 6
  4. 7
Explanation

To solve this proportion, we can use the following steps:

Write the proportion as a fraction: 3/x = 12/20

Cross-multiply: 3 × 20 = 12 × x

Simplify: 60 = 12x

Divide both sides by 12: x = 60/12

Simplify: x = 5

So, the value of x is 5.

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A sum of money is divided between A and B in the ratio 5 : 7. If B receives Rs. 840 more than A, what is the total amount?
  1. Rs. 4,800
  2. Rs. 5,040
  3. Rs. 5,400
  4. None of these
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The present ages of Sami and Adnan are in the ratio of 5:4, respectively. Three years later, the ratio of their ages will become 11:9, respectively. What is Adnan’s present age in years?
  1. 24 years
  2. 25 years
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  2. 250
  3. 300
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