Question : Two numbers are 10% and 25% less than a third number. By what percentage must the second number be increased to make it equal to the first number?
Option 1: 16.67%
Option 2: 20%
Option 3: 15%
Option 4: 60%
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Correct Answer: 20%
Solution :
Let the third number be 100.
Then, the first number is 90 and the second number is 75.
So, the required percentage = $\frac{(90–75)}{75}$ × 100 = $\frac{15}{75}$ × 100 = 20%
Hence, the correct answer is 20%.
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