Quantitative Aptitude - Arithmetic Ability Questions

The value of (2+32-3-342) is

A train left 1 hour later than the scheduled time but in order to reach its destination 200 km away in time, it had to increase its usual speed by 10 km/hr. What is the usual speed (in km/hr) of the train?

The sum of ages of 4 children born at intervals of 4 years each is 60. What is the age of the youngest child?

Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?

In ∆ABC two medians BE and CF intersects at the point O and P,Q are the midpoints of BO and CO respectively. If the length of PQ=3cm, then the length of FE will be

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

1/8 th of the audience of a program Jabardast were children, 2/5th of the audience were men and the rest women. If the number of women audience is 380, find the total number of audience in the program?

If x2+y2+z2-8x+6y-4z+29 = 0, then find the value of z(x+y).