Quantitative Aptitude - Arithmetic Ability Questions

The sum of the ages of Rohit and Ankit is 78. Rohit's age is twice the age of Ankit. What is the age (in years) of Rohit?

The circumference of a circle is 110 cm. Find its radius (in cm).

If tanθ = 815, then 1-sinθ1+sinθ is

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?

Tanya got an increment of 15% in her salary. If her enhanced salary is Rs.14,030. What was her original salary?

If 4x + 3y = 11 and 3x + 2y = 8, then (x,y) is

A, B and C can finish a job working alone in 20, 30 and 60 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to finish the remaining part of the job?

The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?