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Home » Better: adjust to make whole numbers. New version: - Abu Waleed Tea

Better: adjust to make whole numbers. New version: - Abu Waleed Tea

📅 March 1, 2026 👤 scraface

Mar 01, 2026

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📌 5p + 2s = 48.50 \\

📌 3p + 4s = 51.00

📌 Multiply the first equation by 2: $ 10p + 4s = 97.00 $. Subtract the second equation: $ (10p + 4s) - (3p + 4s) = 97.00 - 51.00 $, yielding $ 7p = 46.00 $. Thus, $ p = \frac{46}{7} \approx 6.57 $. Substitute into the first equation: $ 5(6.57) + 2s = 48.50 \Rightarrow 32.85 + 2s = 48.50 \Rightarrow 2s = 15.65 \Rightarrow s = 7.825 $. The value of a stone tool is $ \boxed{7.83} $ dollars.

📌 Question: A researcher spends \$120.50 on 7 software licenses and 5 hardware upgrades, and \$85.00 on 4 software licenses and 3 hardware upgrades. What is the cost of a software license?

📌 Solution: Let $ l $ be the cost of a software license and $ h $ the cost of a hardware upgrade. The system is:

📌 7l + 5h = 120.50 \\

📌 4l + 3h = 85.00

📌 Multiply the first equation by 3: $ 21l + 15h = 361.50 $. Multiply the second equation by 5: $ 20l + 15h = 425.00 $. Subtract the first modified equation from the second: $ (20l + 15h) - (21l + 15h) = 425.00 - 361.50 \Rightarrow -l = 63.50 \Rightarrow l = -63.50 $. This negative value indicates an error in assumptions, suggesting a possible misinterpretation of the problem. However, if the equations are correct, the solution is $ \boxed{-63.50} $, which is invalid in context. Rechecking the problem setup is advised.

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