Quantitative Aptitude - Arithmetic Ability Questions

Simplify 50 + 18 - 8

What is the value of cos 11π/6?

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

When a number is increased by 42, it becomes 121% of itself. What is the number?

The value of a machine depreciates at the rate of 20% per annum. If its present value is Rs 96000, then what was the value (in Rs) of the machine 2 years ago?

The compound interest on Rs. 64,000 for 3 years, compounded annually at 7.5% p.a. is Rs. 64,000

If the simple interest on a sum of money for 2 years at 5% per annum is Rs. 50, the compound interest on the same at the same rate and for the same time is:­

Shivam is 10% less efficient than Vivek. If Vivek can make a helmet in 9 days, then in how many days Shivam can complete the same work?