Multiple choice

There are 10 students in a class. Each of them has 10 chocolates. First student eats 1 chocolate, second eats 2, third eats 3 and so on. Tenth student eats all of his 10 chocolates. What is the average number of chocolates left with the students?

  1. 3.5

  2. 4.5

  3. 5.5

  4. 6.5

  5. 2.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total chocolates = 10 * 10 = 100. Total eaten = 1+2+3...+10 = 55. Total left = 100 - 55 = 45. Average left = 45 / 10 = 4.5.

AI explanation

The total initial number of chocolates is 10 students times 10 chocolates each, giving 100 chocolates. The total number of chocolates eaten is the sum of the first 10 natural numbers, calculated as 10 times 11 divided by 2, resulting in 55 chocolates. Subtracting the eaten chocolates from the initial total leaves 45 chocolates. Dividing these 45 chocolates among the 10 students gives an average of 4.5 chocolates left.

Keep practicing — related questions