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  1. Two numbers are in the ratio 3 : 5. If each number is increased by 10, the ratio becomes 5 : 7. The numbers are ?
    1. 3, 5
    2. 7, 9
    3. 13, 22
    4. 15, 25
Correct Option: D

Let the number be 3a and 5a
Then, (3a + 10) / (5a + 10) = 5/7
∴ 7(3a + 10) = 5 x (5a + 10)
∴ 4a = 20
∴ a = 5

So, the number are 15, 25.


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