Đề thi Olympic Tiếng Anh lớp 11 vòng 19 năm 2013 - 2014

Ben was earning a monthly salary of $5 000 before he changed jobs. At his new job he earns 10% less than he did at his old job. If after one year at his new job Ben receives a pay increase of 15%, how much will he then be earning per month?

In a science experiment, a solution has an initial temperature of 20 °C, as shown above. If the temperature, T, of the solution drops 2.8 °C/h, then which of the following equations can be used to calculate the temperature of the solution after 4 hours?

What is the solution to 2(3 - x) ≤ 8?

What is the solution set to the equation: x2 + 2x − 15 = 0?

Which of the following equations represents the relationship between the variables x and y in the graph shown above?

The list above shows Rick's yearly vehicle expenses. If Rick works 8 hours/day, 5 days/week, and takes home $10/hour, then what is the least number of complete weeks he must work in order to pay for all his yearly vehicle expenses?

A piggy bank contains only quarters and nickels, and there is a total of 60 coins. The total value of the coins in the bank is $7.40. How many quarters are in the piggy bank?

If x = -3, what is the value of x² + 3(x + 2)?

Sam draws two polygons that are similar. The first polygon has a perimeter of 16 cm and the second polygon has a perimeter of 10 cm. If the shortest side of the first polygon has a length of 4 cm, then the corresponding side of the second polygon has a length of