Quantitative Aptitude - Arithmetic Ability Questions

What is the remainder when 6910 is divided by 81?

In the following question, select the odd word from the given alternatives.

What will be the net discount (in %) of two successive discounts of 15% and 35%?

If Cosec θ = 17/8, then what is the value of Cos θ?

If a dairy mixes cow's milk which contains 10% fat with buffalo's milk which contains 20% fat, then the resulting mixture has fat (120/7)% of fat. What ratio was the cow's milk mixed with buffalo's milk?

A watch is listed for Rs.230 and is sold at a discount of 12%, then the sale price of the watch is

The sum of the ages of husband and wife at present is 100. Ten years ago the ratio of their ages was 9:7. What is the age of the husband?

A Navy captain going away from a lighthouse at the speed of 4[(√3) – 1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60 to 45 deg. What is the height (in metres) of the lighthouse?