Question Detail

Find the sum of first 30 natural numbers

  • 470
  • 468
  • 465
  • 463
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1. A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors in a month of 30 days starting with sunday is

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2. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is

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3. Marks of a student were wrongly entered in computer as 83, actual marks of that student were 63. Due to this mistake average marks of whole class got increased by half (1/2). Find the total number of students in that class.

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4. The average of six numbers is X and the average of three of these is Y.If the average of the remaining three is z, then

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  • 2x = y + z
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5. The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother

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  • 42
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