Quantitative Aptitude - Arithmetic Ability Questions

If x – y – √18 = –1 and x + y – 3√2 = 1, then what is the value of 12xy(x2 – y2)?

What is the value of sin 5π/3?

If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2)

The mean of the data 1, 1/2, 1/2, 3/4, 1/4, 2, 1/2, 1/4, 3/4 is

√(cosec2 -­ 1)/cosecA is equal to?

A mason can build a wall in 18 hours. After 9 hours he takes a break. What fraction of the wall is yet to be built?

In a camp 180 students had ration for 20 days. How many students should leave the camp if the ration should last for 25 days?

The mean score in a test of the 10 boys in a class was 15 while the overall mean of the 25 students in the class was 16.2. What was the mean score of the girls?