Quantitative Aptitude - Arithmetic Ability Questions

The ratio of incomes of C and D is 3 : 2. Ratio of income of D and E is 5 : 4. If one-third of C’s income is Rs 4000 more than the half of E’s income, then what is the D’s income (in Rs)?

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

The total surface area of a hemisphere is 166.32 sq cm, find its radius?

1/3 part of a certain journey is covered with the speed of 25 km/hr, 1/2 part of the journey is covered with the speed of 45 km/hr and the remaining part covered with the speed of 37.5 km/hr. What is the average speed (in km/hr) for the whole journey?

A sum fetched a total simple interest of Rs. 7728 at the rate of 7% per year in 8 years. What is the sum?

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

A cricketer, whose bowling average was 12.4 runs/wicket takes 5 wickets for 22 runs in a match, thereby decreases his average by 0.4. The number of wickets, taken by him before this match was:

If 4x - 5y = -37 and 7x + y = -16, then x - y = ______