Quantitative Aptitude - Arithmetic Ability Questions

In a fraction when 3 is added to its numerator and denominator it becomes 4/5. And it becomes 1/2 when 2 is subtracted from both the numerator and denominator. Find the fraction.

In an alloy, aluminium and tin are in the ratio of 4 : 5. In the second alloy, the ratio of same elements is 4 : 7. If equal quantities of these two alloys be mixed to form a new alloy, then what will be the ratio of both of these elements in the new alloy?

If there are four lines in a plane, then what cannot be the number of points of intersection of these lines?

12 men or 30 boys can complete a work in 72 days. How many days will 48 men and 24 boys will take to complete the same work?

What is the simplified value of (sec4 A – tan2 A) – (tan4 A + sec2 A)?

In the following question, select the odd word pair from the given alternatives.

Reflection of the point (3,-6) in the y-axis is

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