Quantitative Aptitude - Arithmetic Ability Questions

X and Y are two alloys which are prepared by mixing zinc and aluminium in the ratio of 1 : 4 and 11 : 8 respectively. If equal quantities of alloys are melted to form a third alloy Z then what is the ratio of zinc and aluminium in alloy Z?

The average of 8 consecutive integers is 23/2. What is the average of first three integers?

If 5x/2 - [7(6x - 3/2)]/4 = 5/8, then what is the value of x?

If 1+121+141+161+181-131-151-17 = 1+ 1x, then what is the value of x?

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

The radius of a cylindrical milk container is half its height and surface area of the inner part is 616 sq.cm. The amount of milk that the container can hold, approximately, is [ Use : √5 = 2.23 and π = 22/7 ]

Find 2 consecutive natural numbers, sum of whose squares is 25.

A spaceship travels at 1,260 km/h. How many metres does it travel in 1/10 th of a second?