Quantitative Aptitude - Arithmetic Ability Questions

20 boys do one fourth of work in 25 days. How many more boys will be required to complete the remaining work in 50 days?

A train is moving at the speed of 72km/hr. How many seconds will it take to cover a distance of 1400 m ?

Sum of a fraction and thrice its reciprocal is 31/6. What is the fraction?

A rectangular swimming pool of length 20 m and breadth 10 m has a uniformly sloping floor. It is 1 m in depth on one end of its length and 3 m at the other. How much water is needed to completely fill this pool? (Take π = 22/7)

If 5+x+5-x5+x-5-x = 3,then what is the value of x ?

The value of (sec245 - cot245) - (sin230 + sin260) is

If the perimeter of a semi-circle is 108 cm, then find its radius (in cm).

A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?