Quantitative Aptitude - Arithmetic Ability Questions

An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is

If (5/9 of x) ­- (2/5 of 9/4) equals ­ -4/5 then find x.

If xy = -18 and x2+ y2= 85, then find the value of (x + y).

Find out the odd word/letters/number/number pair from the given alternatives.

If tan θ + cot θ = x, then what is the value of tan4θ + cot4θ?

If x2+ y2+ z2= xy + yz + zx, then what is the value of (7x + 3y – 5z)/5x?

What is the unit place digit in the expansion of  773?

Two numbers are 35% and 50% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?