Quantitative Aptitude - Arithmetic Ability Questions

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

(1 + sinA)/(1 - sinA) is equal to?

The first and last terms of an arithmetic progression are 23 and ­42. What is the sum of the series if it has 14 terms?

Between 50 and 150 how many numbers are divisible by 7?

If 2x/3 - [5(4x/5 - 4/3)]/2 = 1/3, then what is the value of x?

When a number is increased by 105, it becomes 135% of itself. What is the number?

To go a distance of 40 km upstream a rower takes 8 hours while it takes her only 5 hours to row the same distance downstream. What was the rower's speed in still water?

In a triangle, the distance of the centroid from the three vertices is 4cm, 6cm and 8cm respectively. Then the length of the smallest median is: