Quantitative Aptitude - Arithmetic Ability Questions

Select the odd number from the given alternatives.

What is the area (in sq cm) of a rhombus if the lengths of its diagonals are 25 cm and 20 cm?

If ab+ba = -1, then the value of a2b-b2a is

In the given figure, a circle touches the sides of the quadrilateral PQRS. The radius of the circle is 9 cm. RSP = SRQ = 60 deg and PQR = QPS = 120 deg. What is the perimeter (in cm) of the quadrilateral?

The cash difference between the selling price of an article at a profit of 4% and 6% is Rs. 3. The ratio of two selling prices is:

Ramu can row 9 kmph in still water. It takes him twice as long to row up as to row down. Find the rate of stream.

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

Arun and Amit can do a piece of work in 9 days and 12 days respectively. If they work for alternate days and Amit starts the work first, then in how many days 35/36 parts of whole work will be completed?