Quantitative Aptitude - Arithmetic Ability Questions

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

A bag has Rs.51.25 in the form of 2-rupee, 50-paise and 25-paise coins in the ratio of 3:5:7. What is the total number of 50-paise coins?

A person invested a total sum of Rs 7900 in three different schemes of simple interest at 3%, 5% and 8% per annum. At the end of one year he got same interest in all three schemes. What is the money (in Rs) invested at 3%?

The sum of length, breadth and height of a cuboid is 22 cm and the length of its diagonal is 14 cm.
If S is sum of the cubes of the dimensions of the cuboid and V is its volume, then what is (S-3V) equal to?

From the four corners of a rectangular sheet of dimensions 25 cm x 20 cm, square of side 2 cm is cut off from four corners and a box is made. The volume of the box is

If xy = -30 and x2 + y2 = 61, then find the value of (x + y).

If l + m + n = 9 and l2+m2+n2 = 31, then the value of lm + mn + nl will be

∆PQR is right angled at Q. If cosecP = 17/15, then what is the value of sinR ?