The sum of two numbers is 30. The first number is twice the second number. What are the numbers?

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giorgiana1976 | College Teacher | (Level 3) Valedictorian

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Let the numbers be x and y.

We'll write the equation equivalent to the statement: The sum of the numbers is 30.

x + y = 30

Let the 1st number be x.

Since the 1st number is twice the second, we'll re-write the equation above:

2y + y = 30

3y = 30

y = 10

x = 30 - y => x = 30-10

x = 20

The requested numbers are x = 20 and y = 10.

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