Quantitative Aptitude - Arithmetic Ability Questions

If ab+ba = -1, then the value of a2b-b2a is

The ratio of present ages of L and N is 7 : 5. If the age of N after seven years will be 32 years, then what is the present age (in years) of L?

Profit of Rs 1,03,500 has to be divided between three partners A, B and C in the ratio 11:7:5. How much amount (in Rs) does B get?

Circum center of ΔABC is O. If ∡BAC = 75 and ∡BCA = 80 degrees,

then what is the value of ∡OAC(in deg)?

In ∆XYZ measure of angle Y is 90 deg. If sinX = 4/5, and XY = 6cm, then what is the length (in cm) of side YZ?

If 10x/3 + 5/2(2 - x/3) = 7/2, then the value of x is?

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

The value of x13+x-13x23-1+x-23