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If 15% of (x + y) = 25% of (x - y), then what percent of y is equal to x?
1. 10%
2. 50%
3. 200%
4. 400%

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Correct Answer - Option 4 : 400%

Given:

15% of (x + y) = 25% of (x - y)

Formula used:

Percentage = (Obtained value/Total value) × 100

Calculation:

15% of (x + y) = 25% of (x - y)

⇒ 15(x + y) = 25(x - y)

⇒ 15x + 15y = 25x - 25y

⇒ 15y + 25y = 25x - 15x

⇒ 40y = 10x

⇒ x = 4y

Now, Percentage = (Obtained value/Total value) × 100

⇒ (x/y) × 100

⇒ (4y/y) × 100 

⇒ 400%

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