SOLUTION: A farmer wishes to make a gravel driveway. The mixture needed is two parts pea gravel that cost $9.00 per ton and one part sand that cost $8.00 per ton. The gravel company gave a b

Question 336655: A farmer wishes to make a gravel driveway. The mixture needed is two parts pea gravel that cost $9.00 per ton and one part sand that cost $8.00 per ton. The gravel company gave a bid of $390. How much gravel and sand are they going to deliver.
Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
Let s = the number of tons of sand
Let 2s = the number of tons of pea gravel
9 (2s) + 8s = 390
18 s +8s = 390
26s = 390
s = 15.
So, there are 15 tons of sand and 30 tons of gravel.

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