Quantitative Aptitude - Arithmetic Ability Questions

If 3:27 :: 5:?

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?

A hexagonal prism has 18 edges. How many vertices does it have?

Two pipes, when working one at a time can fill a cistern in 2 hrs and 3 hrs, respectively while a third pipe can drain the cistern empty in 6 hrs. All the three pipes were opened together when the cistern was 1/6 full. How long will it take for the cistern to be completely full?

What is the value of Cot 60°- Cos 45°?

The radius of a hemisphere is 14 cm, find its volume?

(−12)[11+7×(−3)]÷{}[413−(−3)×(−6)]=

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