Quantitative Aptitude - Arithmetic Ability Questions

Dodecahedron has 30 edges. How many vertices does it have?

Mohan starts to calculate sum of all odd natural number less than 83. What result does he get?

10 people could complete a task in 8 days. After 4 days, 2 of the workers left. How many days from then did it take to complete the task?

In the following question, select the odd letter/letters from the given alternatives.

If P : Q = 9 : 7, then what is the value of (P – Q) : (P + Q)?

Which of the following is correct?

The compound interest on Rs. 4000 for 4 years at 10% per annum will be

A bank offers 15% compound interest per half year. A customer deposits Rs 7200 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by means of interest is