Quantitative Aptitude - Arithmetic Ability Questions

The average of 6 consecutive integers is 15/2. What is the average of last three integers?

What is the length of the side of a regular hexagon, if its area is 54√3 sq cm?

If the product of two numbers is 4941 and their LCM is 81, then their HCF is :

If 13A = 11B = 8C, find A : B : C

A and B can do a piece of work in 24 and 30 daysrespectively. Both started the work and worked for 6 days.Then B leaves the work and C joins and the remaining workis completed by A and C together in 11 days. Find the days in which C alone can do the work

In what ratio should coffee powder costing Rs 2500/kg be mixed with coffee powder costing Rs 1500/kg so that the cost of the mixture is Rs 2250/kg?

A person lent Rs 10000 to B for 3 years and Rs 6000 to C for 4 years on simple interest at same rate of interest and received Rs 5400 in all from both of
them as interest. What is the rate of interest (in %)?

If a dairy mixes cow's milk which contains 10% fat with buffalo's milk which contains 20% fat, then the resulting mixture has fat (120/7)% of fat. What ratio was the cow's milk mixed with buffalo's milk?