Question 828202
x  is how many good mangos
y  is how many not so good..


Girl spent {{{(x+y)*7.5}}} P of money for the mangos.
Her revenue was {{{7.90x+7.70y}}}.


Her earning were the profit:  {{{7.9x+7.7y-(x+y)*7.5=34}}} P


You do not have enough described information to find x or y or their sum.  The problem description only allows for one equation in two unknown variables.





-----Pushing a little further------
{{{7.9x-7.5x+7.7y-7.5y=34}}}
{{{0.4x+0.2y=34}}}
{{{0.2x+0.1y=17}}}
{{{2x+y=170}}}
{{{highlight(y=-2x+170)}}}
You can accept any or all positive whole number ordered pairs for x and y.
This may be anything from 85 good mangos and 0 bad mangos; to 0 good mangos and 170 bad mangos.