There are 40 students in a class. If 45% of them are girls. a) How many girls are there?
b) How many boys are there?​

the letter B.how many boys are there?

a=18 b=22

Explanation:

x/40=45/100

100x= 1800

x=18

40-18 is 22

d. direct

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).