Quantitative Aptitude - Arithmetic Ability Questions

Find the odd word/letters/number from the given alternatives.

The number of diagonals in a hendecagon is

Sahil sold an item for Rs. 280 at a loss of 20%. The cost price of the item was

The average age of 36 students in a group is 14 years. When the teacher's age is included in it, the average increases by one. The teacher's age in years is

A, B and C can complete a work in 20, 24 and 30 days respectively. All three of them starts together but after 4 days A leaves the job and B left the job 6days before the work was completed. C completed the remaining work alone. In how many days was the total work completed?

What is the slope of the line parallel to the line passing through the points (3 , -4) and (-2 , 5)?

What is the reflection of the point (3, 2) in the line y = -2?

Simple interest on a sum of Rs 50200 for 3 months is Rs 1380.5. What is the rate (in percentage) of interest per annum?