Quantitative Aptitude - Arithmetic Ability Questions

If R019 is divisible by 11, find the value of the smallest natural number R?

Diameter of wheel of a cycle is 21 cm. The cyclist takes 45 minutes to reach a destination at a speed of 16.5 km/hr. How many revolutions will the wheel make during the journey?

The average revenues of 7 consecutive years of a company is Rs 71 lakhs. If the average of first 4 years is Rs 66 lakhs and that of last 4 years is Rs 78 lakhs. What is the revenue for the fourth year.

The mean score in a test of the 10 boys in a class was 15 while the overall mean of the 25 students in the class was 16.2. What was the mean score of the girls?

The average weight of 30 students in a class is 25 kgs. If the weight of the class teacher is added, the average weight increase by 2 kgs. The weight of the class teacher in kgs is

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?

What is the value of z2+1z2 when z = 5+26 ?

What is the slope of the line perpendicular to the line passing through the points (8,­2) and (3,­1)?