JAMB - Mathematics (2016 - No. 4)
In a school of 150 students, 80 offer French while 60 offer Arabic and 20 offer neither. How many students offer both subjects?
45
10
35
30
解释
80 - x + x + 60 - x + 20 = 150
160 - x = 150
x = 160 - 150 = 10
160 - x = 150
x = 160 - 150 = 10