Question 833327
{{{18+27=45}}} and that is {{{10}}} more than {{{35}}} ,
(a) so the {{{highlight(10)}}} families counted twice have both a car and a bike.
(b) Of the {{{18}}} families that have a car, there are {{{10}}} that also have a bike,
so there are {{{18-10=highlight(8)}}} families that have only a car, but no bike.