Đề thi Olympic Tiếng Anh lớp 11 vòng 7 năm 2013 - 2014

The principal of an elementary school that has a total of 650 students wants to determine which cereal is preferred among the students. Which method of data collection will give the accurate results?

In a ring toss game at a carnival, three rings are tossed over any of three pegs. A ring over peg A is worth one point, over peg B three points and over peg C five points. If all three rings land on pegs, how many different point totals are possible? (It is possible to have more than one ring on a peg)

— At the first stop, several passengers (p) got on the empty bus.
— At the second stop, the number of passengers doubled when more people got on.
— At the third stop, 3 passengers got off the bus and no passengers got on.
— At the fourth stop, 2 passengers got on the bus and no passengers got off.

Mike kept track of the number of passengers on his bus, noticing the above. Which expression represents the number of passengers on the bus after the fourth stop?

Triangle JKE is an obtuse isosceles triangle with m∠E = 10° and KE > JK. What is the measure of ∠J?

What is the least common denominator of 1/2, 2/7x, and 5/x?

The range of f(x) = ax + b is the set of all real numbers, given a and b are real numbers.

Nancy made the statement above. Which produces a counterexample to her statement?

Simplify 9/(x^-1 + 1) for all values of which the expression is defined.

The mileages of the vehicles in a government fleet are normally distributed with a mean of 60000 miles and a standard deviation of 8000 miles. If a vehicle from the fleet is randomly selected, which is closest to the probability that the mileage is greater than 44000 miles?

Kent is using the scale to compare the weight of various solids. How many spheres will balance one cube?