Quantitative Aptitude - Arithmetic Ability Questions

After deducting 12% from a certain sum and then deducting 25% from the remainder, 2508 is left, then what is the initial sum?

The difference between 44% of a number and 33% of the same number is 286. What is the 54% of that number?

A man travels 420 kilometres in, partly by rail and partly by steamer. He spends 8 hours more time on steamer. If the velocity of the steamer is 35 km/hr and the velocity of rail is 65 km/hr, how much distance does he cover by steamer?

The average of 41 consecutive odd numbers is 49. What is the largest number.

cos3A is equal to

Find the LCM of 3.2, 2.72, 1.28 and 1.44

If a : b = c : d = 1 : 6, then what is the value of a2+c2b2+d2?

A can do a work in 36 days and B in 12 days. If they work on it together, then in how many days will they be able to do the work?