ques2) 7+5=12
:. (5/12)*100 = 41.7%
ans=41.7%
ques3) take your compass and place it at point A. The measurement of the compass should be a little bit longer that the mid point of AB. Draw a circle then from there. Now with the same measurement used to draw the circle from A...Draw another circle with B as its' center. Now, there will be 2 points were these circles meet. Take your ruler and join those points. You will then have made the perpendicular bisector of this line.