A garage has 60 vehicles for sale, which
are all either new or second-hand.
28 of the vehicles are cars and the rest are
vans.
Of the cars, 7 are second-hand.
5 of the vans are new.
a) By copying and completing the
frequency tree below to show this
information, work out the value that should
replace D in the frequency tree.
b) In total, how many of the vehicles are
second-hand?