Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of 12-13 ?

A 1.6 m tall observer is 45 meters away from a tower. The angle of elevation from his eye to the top of the tower is 30°, then the height of the tower in meters is

A 150 m long train, travelling at 54 km/h, crosses a platform in 42 seconds. What is the length of the platform?

There were 24 studentsina class. One of them, who was 18 years old, left the class and his place was filled up by a new comer.Ifthe average of the class was thereby lowered by 1 month, the age of new comer is-

Which of the following is a reductible fraction?

A boy buys 5 pencils at Rs 3 each, 3 erasers at Rs 2 each and 3 sharpeners at Rs 5 each. What is the average expenditure (in Rs) per article?

A man starts moving from a place A and reaches the place B in 26 hours. He covers 1/3rd of the distance at the speed of 4 km/hr and covers the remaining distance at the speed of 5 km/hr. What is the distance (in km) between A and B?

What number should be added to each of the numbers 55, 100, 65 and 116, so that the resulting numbers are in continued proportion?