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3. Three times the result of subtracting a certain number from 7 gives the san answer as adding eleven to the number. Find the number. \( 3 \times(7-x)= \) 4. I think of a number. If I divide the sum of 6 and the number by 3 , the result

Ask by Norton Pierce. in Australia
Jan 20,2025

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Tutor-Verified Answer

Answer

**Problem 1:** The certain number is 2.5. **Problem 2:** Cannot determine the number with the given information.

Solution

Let's solve the first problem step by step. ### Problem 1: **Statement:** Three times the result of subtracting a certain number from 7 gives the same answer as adding eleven to the number. **Let:** - \( x \) be the certain number. **Equation:** From the problem statement, we can set up the equation: \[ 3 \times (7 - x) = x + 11 \] Now, let's solve this equation step by step. 1. **Expand the left side:** \[ 3 \times (7 - x) = 21 - 3x \] So, the equation becomes: \[ 21 - 3x = x + 11 \] 2. **Rearrange the equation:** Add \( 3x \) to both sides: \[ 21 = 4x + 11 \] Now, subtract \( 11 \) from both sides: \[ 21 - 11 = 4x \] This simplifies to: \[ 10 = 4x \] 3. **Solve for \( x \):** Divide both sides by \( 4 \): \[ x = \frac{10}{4} = 2.5 \] ### Conclusion for Problem 1: The certain number is \( 2.5 \). --- ### Problem 2: **Statement:** I think of a number. If I divide the sum of 6 and the number by 3, the result... It seems like the statement is incomplete. However, I can help you set up the equation based on the information provided. **Let:** - \( y \) be the number you think of. **Equation:** If you divide the sum of 6 and the number by 3, it can be expressed as: \[ \frac{6 + y}{3} \] If you provide the result or any additional information, I can help you solve for \( y \). Please complete the statement for the second problem!

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The Deep Dive

Did you know that equations were first introduced in ancient civilizations, like Babylon around 2000 BCE? They used clay tablets to solve problems related to trade and land measurement! This early form of algebra shows that humans have been fascinated with numbers and their relationships for thousands of years. In the real world, equations aren’t just for math classes. Engineers, scientists, and even economists use them daily to model behaviors, predict outcomes, and make informed decisions. For instance, when designing a bridge, engineers will create equations to determine load capacity, ensuring everything is safe and sound. Equations are the backbone of so many fields!

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