Amazon Senior Process Associate interview questions

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A topic on Future of Online shopping in developing countries like India. Aptitude - 1. A, B, C and D are four consecutive odd numbers and their average is 42. What is the product of B and D? 2. The cost price of item A, Item A was sold at a profit of 10% and Item B was sold at a loss of 20%. If the respective ratio of selling price of items A and B is 11:12, what is the cost price of item B? 3. A car covers the first 30 km of its journey in 45 minutes and the remaining 25 km in 30 minutes. What is the average speed of the car? 4.Four examiners can examine a certain number of answer papers in 10 days by working for 5 hours a day. For how many hours a day would 2 examiners have to work in order to examine twice the number of answer papers in 20 days?