Quantitative Aptitude - Arithmetic Ability Questions

If cosπ/4c - tanπ/4c = x, then x is

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

If cosecA - cotA = x, then the value of x is

A canteen requires 56 kgs of rice for seven days . The quantity of rice required for the months of April and May together is

2*[­0.3(1.3 + 3.7)] of 0.8 = ?

In ΔXYZ measure of angle Y is 90 deg. If cot X = 5/12, and XY = 2.5 cm, then what is the length (in cm) of side XZ?

If a retailer offers a discount of 28% on the marked price of his goods and thus ends up selling at cost price, what was the % mark up?

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