Of the 500 consumers surveyed, 78 percent said they own a toaster, 65 percent they own a microwave oven and , 52 percent said they own both a toaster and a microwave oven. How many of the consumers surveyed said that do not own either a toaster or a microwave oven ?
a 45
b 55
c 65
d 95
e 130
any helps with this kind of question without use the Van diagram? I saw a sort of table which is very userful for this kind of question, anyone know how structure the table?
a 45
b 55
c 65
d 95
e 130
any helps with this kind of question without use the Van diagram? I saw a sort of table which is very userful for this kind of question, anyone know how structure the table?