Question 205729
{{{c}}} = ounces of cantaloupe in salad
{{{s}}} = ounces of strawberry in salad
{{{b}}} = ounces of banana in salad
given:
{{{c + s + b = 40}}} 
{{{b/s = 3/1}}}
{{{c = s}}}
and
{{{b/s = 3}}}
{{{b = 3s}}}
rewriting the 1st equation:
{{{s + s + 3s = 40}}}
{{{5s = 40}}}
{{{s = 8}}} oz
and
{{{c = s}}}
{{{c = 8}}} oz
and, since
{{{c + s + b = 40}}}
{{{8 + 8 + b = 40}}}
{{{b = 40 - 16}}}
{{{b = 24}}}
There are  24 ounces of bananas in the salad
check:
{{{b/s = 3}}}
{{{24/8 = 3}}}
{{{24 = 24}}}
OK