In a certain city, one-seventh of the population who are left-handed are also short-sighted, and two-ninths who are short-sighted are also left-handed.
One twelfth are neither left-handed nor short-sighted.
Mr F asks: 1/12 of what? The total population?
Given that the number of people who are left-handed and short-sighted is
, draw a Venn diagram to illustrate this information.
(The Venn diagram should show the number of elements, in terms of
, in each area.)
Find the fraction of the population who are
a)left-handed but not short-sighted,
b)either left-handed or short-sighted, but not both.
If there are 154000 people who are left-handed, find the total population.