Quantitative Aptitude - Arithmetic Ability Questions

If 15% of x is three times of 10% of y, then x:y = 

If a:b = 5:8, find the value of (6a -­ 5b)/(a + 2b).

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 506, then what is the difference between the first and the third number?

A,B and C contract a work for Rs. 440. Together A and B are to do 9/11 of the work. The share of C should be:

P, Q and R alone can complete a work in 12, 15 and 20 days respectively. In how many days will they together complete the same work?

Volume of a cylinder is 770 cubic cm. If circumference of its base is 22 cm, what will be the curved surface area of the cylinder? (Take π = 22/7)

A bag has Rs12.9 in the form of 1 rupee, 50 paise and 10 paise coins in the ratio of 3:2:3. How many 50 paise coins are there in the bag?