Quantitative Aptitude - Arithmetic Ability Questions

The labourers A, B, C were given a contract of Rs. 750 for doing a certain piece of work. All the three together can finish the work in 8 days. A and C together can do it in 12 day, while A and B together can do it in 13 1/3 days. The money will be divided in the ratio

What is the average of all numbers between 9 and 90 which are divisible by 8?

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

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?

Ratio of present ages of P and Q is 9 : 4. The difference between their ages is 20 years. What will be the sum (in years) of their ages after 10 years?

If medians of a triangle have lengths 18 cm, 24 cm and 30 cm, then what is the area (in sq.cm) of the triangle?

The length of the diagonal and the breadth of a rectangle are 17 cm and 8 cm respectively. Find its perimeter (in cm).

The area of a triangle with vertices A (0, 8) , O (0,0) and B (5, 0) is: