Quantitative Aptitude - Arithmetic Ability Questions

What least value must be assigned to '*' so that the number 63576 * 2 is divisible by 8?

The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:

A boy running at 10/9 th of his actual speed covers 39 km in 2 hours 20 minutes and 24 seconds. Find the actual speed of the boy (approx.)

The circumferences of two circles are touching externally. The distance between their centres is 12 cm. The radius of one circle is 7 cm. Find the diameter(in cm) of the other circle.

The marked price of an article is Rs 960 and it is sold at a discount of Rs 192. What is the discount percentage?

What is the slope of the line parallel to the line passing through the points (4,-2) and (-3,5)?

What is the value of sin 300°?

A thief is stopped by a policeman from a distance of 150 metres. When the policeman starts the chase, the thief also starts running. Assuming the speed of the thief as 7 km/hr and that of policeman as 9 km/hr, how far the thief would have run, before he is over- taken by the policeman?