Quantitative Aptitude - Arithmetic Ability Questions

What is the value of (cos 40° – cos 140°)/(sin 80° + sin 20°)?

In how many months will Rs 8,000 yield Rs 2,648 as compound interest at 20% per annum compounded semi-annually?

If x2+ y2+ z2= xy + yz + zx, then what is the value of (7x + 3y – 5z)/5x?

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

In ∆ABC, ∠A = 90°, AD ⊥ BC and AD = BD = 2 cm. The length of CD is

A does 1/2 as much work as B and C does1/2as much work as A and B together. If C alone can finish the work in 40 days, then together all will finish the work in

The Simplified form of (b3x2a4z3)*(b4x3a3z2)/(a2b4z3) is

The price of rice has increased by 60%. In order to restore the original price, the new price must be reduced by