Statistics for Math olympiads problems

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Question	Answer	% Correct
In a box, there are blue balls and red balls, and we know that the number of red balls is double the number of blue balls. If we add 4 red balls, the number of red balls is 3 times the number of blue balls. What was the number of balls in the box before we added the new balls?	12	75%
What is the value of 1+2+3+...+100 ?	5050	75%
How many positive integers divide 68276 ? (Hint: 68276: 2²x13²x101)	18	63%
Let ABCD be a square, and E a point inside ABCD such as ABE is an equilateral triangle. What is the value of angle CÊD ? (in degrees)	150	38%
James wants to color every positive integer between 1 and 10, but he cannot color two consecutive integers with the same color. If he has 4 different colors, how many coloring possibilities does he have? (you can use a calculator :)	78732	38%