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The cost of a toy is $20 less than 2 times the cost of a toy train. If the cost of the toy car is $100, what is the cost of the toy train?
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The cost of a toy is $20 less than 2 times the cost of a toy train. If the cost of the toy car is $100, what is the cost of the toy train?
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Oct 12, 2019
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The cost of a toy is $20 less than 2 times the cost of a toy train. If the cost of the toy car is $100, what is the cost of the toy train?
Mathematics
middle-school
Mtxz
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---------------------------------------------------------------------
Define x :
---------------------------------------------------------------------
Let the cost of the toy train be x.
Toy Train = x
Toy car = 2x - 20
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Construct equation :
---------------------------------------------------------------------
The toy car costs $100.
⇒ 2x - 20 = 100
---------------------------------------------------------------------
Solve x :
---------------------------------------------------------------------
2x - 20 = 100
2x = 100 + 20
2x = 120
x = 60
---------------------------------------------------------------------
Find the cost of the toy train :
---------------------------------------------------------------------
Cost of the toy train = x = $60
---------------------------------------------------------------------
Answer: The toy train costs $60.
---------------------------------------------------------------------
Alvarez
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Oct 14, 2019
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Alvarez
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The toy is 2(x)-20, x is 100, being the toy car. So 2(100)= 200 -20 =180. The cost of the toy is $180
Nitin Wahale
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Oct 15, 2019
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Nitin Wahale
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