Directions: Enter your answer as an integer or a decimal if there is a single answer box OR as a fraction if there are two separate boxes — one for the numerator and one for the denominator.
1. The breadth of a rectangle becomes one and a half times itself and the length increases by 40%. What is the percentage change in the area of the rectangle?
%
2. The volume of a cylindrical pipe is 17600 cc. Its height is 14cm and the external radius is 25cm. Find the thickness of the cylinder.
cm
3. Find the value of a for which a+5, 3a-10 and 2a+a/2 are in AP
10. How many straight lines can be drawn by joining 12 points in a plane when no three points are collinear?