First 2 common multiples of 8 and 9

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

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Find the area of the unshaded square