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 \( 2 S+L=120 \)
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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.