Quantitative Aptitude - Arithmetic Ability Questions

What is the value of (3/5 + 7/9)?

If [2(4x/5 - 3/4)]/3 - 5/3 = -1/6, then the value of x is?

If cosπ/4c - tanπ/4c = x, then x is

54% of 4000 is

The ratio of the number of boys and girls in a school is 3:2. If 20% of the boys and 25% of the girls are scholarship holders, the percentage of the school students who are not scholarship holders is

If a+b=5 then the value of a-37+b-27 is

The circumferences of two circles are touching externally. The distance between their centres is 12 cm. The radius of one circle is 7 cm. Find the diameter(in cm) of the other circle.

Two equal circles intersect so that their centres, and the points at which they intersect form a square of side 1 cm. The area (in sq.cm) of the portion that is common to the circles is