Quantitative Aptitude - Arithmetic Ability Questions

If A : B = 3 : 4 and B : C = 6 : 5 then A : (A + C) is

Find the LCM of 12, 16, 20 and 24.

The mean of marks secured by 35 students in division A of class X is 65, 45 students of division B is 61 and that of 70 students of division C is 59. What is the mean of marks of the students of three divisions of Class X?

ΔXYZ is right angled at Y. If cosX = 3/5, then what is the value of cosecZ ?

The volume of a right circular cone, whose radius of the base is same as one-third of its altitude, and the volume of a sphere are equal. The ratio of the radius of the cone to the radius of the sphere is :

A boat is sailing towards a lighthouse of height 20√3 m at a certain speed. The angle of elevation of the top of the lighthouse changes from 30° to 60° in 10 seconds. What is the time taken (in seconds) by the boat to reach the lighthouse from its initial position?

What is the value of sin ­-300°?

Select the odd word/letters/number/number pair from the given alternatives.