15. यदि दो संख्याएँ एक तीसरी संख्या की क्रमशः 28% और
70% हैं, तो पहली संख्या दूसरी संख्या की कितने प्रतिशत है?
(a) 15%
(b) 30%
35%
(d) इनमें से कोई नहीं
(
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Option d is correct.
- The Latin word "per centum," which meaning "by the hundred," was the source of the English word "percentage." Fractions with a denominator of 100 are called percentages. In other words, it is a relationship where the value of the entire is always assumed to be 100.
- A percentage is a certain number or part in every hundred. It is a fraction with the denominator 100, and the letter "percent" stands for it.
- Finding the percentage of a whole in terms of 100 is what percentage calculation refers to. A percentage can be found in one of two ways that is by using the unitary approach and by adjusting the fraction's denominator to 100.
- It should be noted that when the denominator is not a factor of 100, the second technique of percentage calculation is not applied. In these situations, we employ the unitary technique.
According to the given information,
Let the third number be x. Then, the first number is 28% of x and the second number is 70% of x.
We need to find what percentage of the second number is the first number.
Now,
That is, the first number is 40% of the second number.
Hence, option d is correct.
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