Mathematics
Grade6
Easy

Question

279 are 90% of what amount?

  1. 130
  2. 310
  3. 200
  4. 280

hintHint:

When a certain quantity is divided into 100 equal parts and a certain part of it is to be expressed in terms of the whole quantity, that portion is called as a percent, represented with a % sign.
Eg.- If we have 1,000 as the number of students in class 12th in a certain college with 700 inhouse students and 300 new entrants and we want to represent the number of inhouse students and new entrants as a percentage of the total population, we divide 1,000 in 100 equal parts i.e. 1,000/100, we get 1% = 10. Hence, inhouse students and new entrants are 70% (10*70 i.e. 700) and 30% (10*30 i.e. 300), respectively.

The correct answer is: 310


    To find- 90% of what number is 279.
    Solution-
    Let the number be x.
    We know that 90% can be written as 90/100.
    ∴ 90% of x = 279
    ∴ 90/100 * x = 279
    ∴ x = 279 * 100/ 90
    ∴ x = 310
    Final Answer- Option 'b' i.e. '310' is the correct answer to the given question.

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