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igor_vitrenko [27]
3 years ago
6

A parking lot has a total of 60 cars and trucks. the ratio of cars to trucks is 7:3. how many cars are in the parking lot? how m

any trucks are in the parking lot? justify your answers.
Mathematics
1 answer:
Vinil7 [7]3 years ago
7 0
A) c + t = 60
B) 3c = 7t
Multiplying A) by -3
A) -3c + -3t = -180 then adding this to b
B) 3c = 7t
180 = 10t
trucks = 18
cars = 42


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Percentage of depreciation of the car that Marie bought = 15%
Present value of the car = 13000
Let us assume that the value of the car at the time of buying = x
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The percentage valuation of the car now = (100 - 15) percent
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x = 1300000/85
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