Question 1135719
My Venn diagram shows:
(1)
{{{ x + x + 7 + 8 = 47 }}}
{{{ 2x + 15 = 47 }}}
{{{ 2x = 32 }}}
{{{ x = 16 }}}
(2)
Number who traveled by at least 2 means:
{{{ x + 8 + 7 + 3 = x + 18 }}}
{{{ x + 18 = 16 + 18 }}}
{{{ x + 18 = 34 }}}
This is:
[ bus and car only ] and [ train and car only ] 
and [ bus and train only ] and [ all three only ]