SOLUTION: Alison's school had a car wash as a fundraiser. They charged $4's for cars and $7's for trucks. After washing a total of 31 vehicles they had $140. Alison thinks someone was ste

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Question 878143: Alison's school had a car wash as a fundraiser. They charged $4's for cars and $7's for trucks. After washing a total of 31 vehicles they had $140. Alison thinks someone was stealing money---do the numbers support her claim.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If all the vehicles were cars, the amount
would be +31%2A4+=+124+
If one of the vehicles was a truck,
+30%2A4+%2B+1%2A7+=+127+
If 2 were trucks,
+29%2A4+%2B+2%2A7+=+130+
If 3 were trucks
+28%2A4+%2B+3%2A7+=+133+
If 4 were trucks
+27%2A4+%2B+4%2A7+=+136+
If 5 were trucks
+26%2A4+%2B+5%2A7+=+139+
If 6 were trucks
+25%2A4+%2B+6%2A7+=+142+
If If 7 were trucks
+24%2A4+%2B+7%2A7+=+145+
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Someone had to have either added some money
or taken some money for the total to be $140