Quantitative Aptitude - Arithmetic Ability Questions

2sin[(C+D)/2].cos[(C­-D)/2] is equal to

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

What is the value of S = 11x3x5 + 11x4 + 13x5x7 + 14x7 + 15x7x9 + 17x10 + ... upto 20 terms. Then what is the value of S? 

The length of the diagonal and the breadth of a rectangle are 17 cm and 8 cm respectively. Find its perimeter (in cm).

If in a two digit number, the digit at unit place is y and the digit at tens place is 5, then the number is

A and B undertake a piece of work for Rs. 250 . A alone can do that work in 5 days and B alone can do that work in 15 days . With the help of C, they finish the work in 3 days . If every one gets paid in proportion to work done by them, the amount C will get is 

If PA and PB are tangents to the circle with centre O such that ∠APB=50°, then the ∠OAB=

The volume of metallic cylindrical pipe of uniform thickness is 748 c.c. Its length is 14 cm and its external radius is 9 cm. The thickness of the pipe is