Pregunta
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The sum of two numbers is 95 . If the larger number is increased by twice the smaller number, the result is 120 . What is the larger number? If \( S \) = the smaller number and \( L \) = the larger number, then which of the following systems of equations represents the word problem? \( S+L=95 \) and \( S+2 L=120 \) \( S+L=95 \) and \( 2(S+L)=120 \) \( S+L=95 \) and \( 2 S+L=120 \)

Ask by Young Lyons. in the United States
Feb 27,2025

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The correct system of equations is: - \( S + L = 95 \) - \( L + 2S = 120 \) The larger number is 70.

Solución

To solve the problem, we need to extract the known conditions and set up the correct system of equations based on the information provided. 1. **Extracting Known Conditions:** - The sum of two numbers (smaller number \( S \) and larger number \( L \)) is 95: \[ S + L = 95 \] - If the larger number \( L \) is increased by twice the smaller number \( S \), the result is 120: \[ L + 2S = 120 \] 2. **Identifying the Correct System of Equations:** - The first equation is \( S + L = 95 \). - The second equation is \( L + 2S = 120 \). Thus, the correct system of equations that represents the word problem is: \[ S + L = 95 \quad \text{and} \quad L + 2S = 120 \] Now, let's solve this system of equations to find the larger number \( L \). ### Step-by-Step Solution: 1. From the first equation, we can express \( L \) in terms of \( S \): \[ L = 95 - S \] 2. Substitute \( L \) into the second equation: \[ (95 - S) + 2S = 120 \] 3. Simplify the equation: \[ 95 - S + 2S = 120 \] \[ 95 + S = 120 \] 4. Solve for \( S \): \[ S = 120 - 95 \] \[ S = 25 \] 5. Now substitute \( S \) back into the equation for \( L \): \[ L = 95 - S = 95 - 25 = 70 \] ### Final Answer: The larger number \( L \) is \( 70 \). Thus, the correct system of equations is: - \( S + L = 95 \) - \( L + 2S = 120 \)

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To solve this word problem and find the larger number, we first need to set up the correct system of equations based on the given information. The first equation, \( S + L = 95 \), accurately represents that the sum of the smaller number \( S \) and the larger number \( L \) is 95. For the second condition, "if the larger number is increased by twice the smaller number," translates to \( L + 2S = 120 \). So, the correct set of equations is \( S + L = 95 \) and \( L + 2S = 120 \). Therefore, the largest number \( L \) and the smaller number \( S \) can be derived through these equations. To find the larger number, let’s manipulate the equations: from \( S + L = 95 \), we can express \( L \) as \( L = 95 - S \). Substituting into the second equation results in \( (95 - S) + 2S = 120 \). Simplifying this gives you \( 95 + S = 120\), leading to \( S = 25 \). Plugging that back into our first equation gives us \( L = 95 - 25 = 70\). So, voila! The larger number \( L \) is 70.

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