Question 524081
{{{x}}} is the number of houses with floor plan 1
{{{y}}} is the number of houses with floor plan 2
{{{ x + y = 56 }}} is correct
There are three times as many homes available 
with the second floor plan than the first.
{{{ y = 3x }}}
This just says that {{{y}}} is {{{3}}} times bigger
than {{{x}}}