There are 30 cupcakes in a tin. 16 of the
cupcakes are iced, of which 3 contain
walnuts. 5 cupcakes are neither iced nor
contain walnuts.
a) Draw a Venn diagram that shows the
information above.
b) Work out the probability that a
cupcake picked at random contains
walnuts.
Give your answer as a fraction in its
simplest form.