Quantitative Aptitude - Arithmetic Ability Questions

If x - y = -9 and xy = -20, then find x2 + y2 ?

If a2b+c=b2c+a=c2a+b=1 then the value of 21+a+21+b+21+c

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?

The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is :

If θ be positive acute angle and 5cosθ + 12sinθ = 13, then the value of cosθ is

A boy running at 10/9 th of his actual speed covers 39 km in 2 hours 20 minutes and 24 seconds. Find the actual speed of the boy (approx.)

Two labourers A and B are paid a total of Rs. 750 per day. If A is paid 150 percent of what is paid to B, how much (in Rs) is B paid?