Quantitative Aptitude - Arithmetic Ability Questions

Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern in 4 and 10 hrs, respectively, the third can drain the cistern, when filled, in 6 hrs. If all the three pipes are opened simultaneously when the cistern is half-full, how many hours will be needed to fill the cistern?

The measures of the four angles of a quadrilateral are in the ratio 1:2:4:5. What is the measure of the biggest angle?

Length of three line segments isgiven. Is construction of a triangle possible with the segments in the given cases?

32% of a number is 80. What is the number?

If 2sec2x - tan2x = 5 and 0° ≤ x ≤ 90°, then x = ?

What is the diameter (in cm) of a sphere of surface area 6.16 sq cm?

The orthocentre of a triangle is the point where

In the following question, four number pairs are given. The number on left side of (–) is related to the number on 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.