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If two numbers are respectively 20% and 40% of a 3rd number then what % is the 1st number of the 2nd one?
- a)10
- b)20
- c)30
- d)50
Correct answer is option 'D'. Can you explain this answer?
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Solution:
Let the third number be x.
According to the question,
First number = 20% of x
Second number = 40% of x
We need to find what % is the first number of the second one.
Let's begin by calculating the actual values of the first and second numbers.
First number = (20/100) x = 0.2x
Second number = (40/100) x = 0.4x
Now, to find what % is the first number of the second one, we need to divide the first number by the second number and multiply by 100.
(0.2x / 0.4x) x 100 = 50%
Therefore, the first number is 50% of the second number.
Answer: (d) 50%
Let the third number be x.
According to the question,
First number = 20% of x
Second number = 40% of x
We need to find what % is the first number of the second one.
Let's begin by calculating the actual values of the first and second numbers.
First number = (20/100) x = 0.2x
Second number = (40/100) x = 0.4x
Now, to find what % is the first number of the second one, we need to divide the first number by the second number and multiply by 100.
(0.2x / 0.4x) x 100 = 50%
Therefore, the first number is 50% of the second number.
Answer: (d) 50%
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