Quantitative Aptitude - Arithmetic Ability Questions

An alloy is made by mixing metal A costing Rs 2000/kg and metal B costing Rs 400/kg in the ratio A:B = 3:1. What is the cost (in Rs) of 8 kilograms of this alloy?

Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.

The curved surface area and the slant height of a right circular cone are 99 sq.cm and 9 cm respectively. Find its diameter (in cm)

If a:b = 3:8, find the value of (5a ­ 3b)/(2a + b).

If x = y + 2 then x3 - y3 - z3 is

A shopkeeper by selling 13 Titan watches, earns a profit equal to the selling price of 3 Titan watches. His profit percentage is

If 3a=4b=6c and a+b+c=279 then a2+b2+c2 is equal to

If P travelled the first half of a journey at 40 kmph and the the remaining distance at 50 kmph, what is the average speed of his travel?