Question

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?

Answer 1

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Define x :
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Let the cost of the toy train be x.
Toy Train = x
Toy car = 2x - 20

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Construct equation :
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The toy car costs $100.
⇒ 2x - 20 = 100

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Solve x :
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2x - 20 = 100
2x = 100 + 20
2x = 120
x = 60 

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Find the cost of the toy train :
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Cost of the toy train = x = $60

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Answer: The toy train costs $60.
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Answer 2

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