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Teacher took exam for English, average for the entire class was 80 marks. If we say that 10% of the students scored 95 marks and 20% scored 90 marks then calcualte average marks of the remaining students of the class.

  • 60
  • 70
  • 75
  • 80

Answer: Option C

Explanation:

Lets assume that total number of students in class is 100 and required average be x.
Then from the given statement we can calculate :
(10 * 95) + (20 * 90) + (70 * x) = (100 * 80)

=> 70x = 8000 - (950 + 1800) = 5250

=> x = 75.

Similar Questions :

1. 88% of 370 + 24% of 210 - x = 118

  • 150
  • 250
  • 158
  • 258

Answer: Option D

2. 1/2 is what percent of 1/3

  • 150%
  • 200%
  • 250%
  • 300%

Answer: Option A

Explanation:

1/2/1/3 * 100 = 1/2 * 3/1 * 100 = 150 %

3. One fourth of one third of two fifth of a number is 15. What will be40% of that number

  • 140
  • 150
  • 180
  • 200

Answer: Option C

Explanation:

(1/4) * (1/3) * (2/5) * x = 15 then x = 15 * 30 = 450
40% of 450 = 180

4. If number x is 10% less than another number y and y is 10% more than 125, then find out the value of x

  • 123.55
  • 123.65
  • 123.75
  • 123.85

Answer: Option C

5. Raman's salary was decreased by 50% and subsequently increased by 50%. How much percent does he loss.

  • 75
  • 65
  • 45
  • 25

Answer: Option D

Explanation:

Let the origianl salary = Rs. 100

It will be 150% of (50% of 100)
= (150/100) * (50/100) * 100 = 75

So New salary is 75, It means his loss is 25%

Read more from - Percentage Questions Answers
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