Two numbers are in the ratio of 5 ∶ 7. If 6 be added to each, the ratio becomes 3  4. Find the numbers.

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SSC CGL 2022 Tier-I Official Paper (Held On : 05 Dec 2022 Shift 4)
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  1. 30, 42
  2. 55, 88
  3. 10, 16
  4. 25, 40

Answer (Detailed Solution Below)

Option 1 : 30, 42
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Detailed Solution

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Given:

Ratio of two numbers = 5 : 7

When 6 is added to each, new ratio = 3 : 4

Calculation:

Let the numbers be 5x and 7x.

According to the question,

⇒ \(\frac{5x+6}{7x+6}=\frac{3}{4}\)

⇒ 4(5x + 6) = 3(7x + 6)

⇒ 20x + 24 = 21x + 18

⇒ 21x – 20x = 24 – 18

⇒ x = 6

First number = 5x = 5 × 6 = 30

Second number = 7x = 7 × 6 = 42

Therefore, the two numbers are 30 and 42.

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