Question 1110652
w white envelopes
b blue envelopes


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some white envelopes at $.02 per envelope and some blue envelopes at $.035 per envelope. Total cost was $240.50. 
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If that is all the description, then you can only account for the cost using what was given.


{{{0.02w+0.035b=240.5}}}

{{{20w+35b=240500}}}

{{{highlight_green(4w+7b=48100)}}}-----------from here, you can look for any or all whole number solutions  for points  (w,b).