The interior angle of a regular polygon exceeds its exterior angle by . The number of sides of the polygon is:

16 boys or 12 women can do a piece of work in 28 days. In how many days will the same work be done by 4 boys and 4 women, if they all work together?

Which of the following is the largest fraction    

In an examination a student had to find 3/14 of a number, he found 3/4th by mistake, his answer was 150 more than the correct answer, find the required number.

If the ratio of the heights of two identical triangles is 4: 9, find the ratio of the areas of the two triangles.

If then what is the value of (x+y-z)?

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

An article seller allows a discount of 10% on the marked price. He gets 30% commission from the publisher. What will be his profit percentage?