SOLUTION: A computer consultant's time is billed at $90 per hour and his assistant's time is billed at $40 per hour. A customer recieves a bill for $3500. If the assistant worked 10 hours

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Question 548995: A computer consultant's time is billed at $90 per hour and his assistant's time is billed at $40 per hour. A customer recieves a bill for $3500. If the assistant worked 10 hours less than the consultant, how much time did each bill?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +t+ = consultant's time
+t+-+10+ = assistant's time
given:
+3500+=+90t+%2B+40%2A%28+t+-+10+%29+
+3500+=+90t+%2B+40t+-+400+
+130t+=+3900+
+t+=+30+
+t+-+10+=+20+
The consultant billed 30 hrs
The assistant billed 20 hrs