In a group of 120 secretaries, 82 of them are good at typing, 51 are good at both typing and shorthand, while 54 are poor at shorthand. Some secretaries are poor at both typing and shorthand.
a)How many are good at shorthand but poor at typing?
b)How many are poor at typing?
math - jay, Tuesday, October 13, 2015 at 5:17pm