Quantitative Aptitude - Arithmetic Ability Questions

If cosπ/4c - tanπ/4c = x, then x is

If the angles of a triangle are in the ratio of 1 : 4 : 7, then find the ratio of the greatest angle to the smallest angle.

Two fractions are such that their product is ­4 and sum is ­32/15. Find the two fractions.

The ratio of present ages of Ramita and Satyajit is 9:7. After 9 years the ratio of their ages will be 5:4. What is Ramita's present age?

What will be the sum of the measures all the interior angles of a polygon having 14 sides?

If the measures of the angles of a triangle are in the ratio. 1:2:3 and if the length of the smallest side of the triangle is 10cm, then the length of the longest side is

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

Find the smallest 8 digit number which is exactly divisible by 121.