Quantitative Aptitude - Arithmetic Ability Questions

Which of the following is not a quadratic equation?

Find the odd word/letters/numbers pair from the given alternatives.

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

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

Instead of multiplying by 25, a student multiplies that number by 52 and gets 324 more than correct answer. Then that number is

Pipes A and B, when working together, can fill an empty tank in 8 hours. If B is stopped after 2 hours, it will take a total of 11 hrs to fill the tank. How long would it take A to fill the empty tank alone?

A mixture of alcohol and water contains 7% alcohol. How much mixture (in litres) is required to get 357 litres of alcohol?

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?