Determine the scale factor for each pair of shapes and label the missing length

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Based on the figures as marked, /\rqs = —

Find the solution of this system of equation -7x+y=-20 9x-3y=36