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1. Three consecutive natural numbers add up to 24 . Find the numbers. 2. A mother is three times as old as her daughter. In 12 years' time she will be twice as old as her daughter will be then. How old is the mother now? 3. The perimeter of a rectangular flower bed is 26 m . If the length exceeds the breadth by 3 m , find its dimenin

Ask by Rowe Evans. in South Africa
Mar 20,2025

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1. The three consecutive natural numbers are 7, 8, and 9. 2. The mother is 36 years old now. 3. The rectangular flower bed has a breadth of 5 meters and a length of 8 meters.

Solución

**1. Three consecutive natural numbers add up to 24** Let the numbers be \( n \), \( n+1 \), and \( n+2 \). The equation becomes: \[ n + (n+1) + (n+2) = 24 \] Simplify: \[ 3n + 3 = 24 \] Subtract 3 from both sides: \[ 3n = 21 \] Divide both sides by 3: \[ n = 7 \] Thus, the three numbers are: \[ 7,\quad 8,\quad 9 \] --- **2. A mother is three times as old as her daughter. In 12 years' time she will be twice as old as her daughter will be then. How old is the mother now?** Let the daughter's age be \( d \) and the mother's age be \( m \). Given: \[ m = 3d \] In 12 years, the ages will be \( m+12 \) and \( d+12 \), and it is given that: \[ m+12 = 2(d+12) \] Substitute \( m = 3d \) into the equation: \[ 3d + 12 = 2d + 24 \] Subtract \( 2d \) from both sides: \[ d + 12 = 24 \] Subtract 12 from both sides: \[ d = 12 \] Now, find \( m \): \[ m = 3 \times 12 = 36 \] Thus, the mother is: \[ 36 \text{ years old} \] --- **3. The perimeter of a rectangular flower bed is 26 m. If the length exceeds the breadth by 3 m, find its dimensions.** Let the breadth be \( b \) and the length be \( b+3 \). The perimeter \( P \) of a rectangle is given by: \[ P = 2(\text{length} + \text{breadth}) \] Substitute the given values: \[ 2(b + (b+3)) = 26 \] Simplify inside the parentheses: \[ 2(2b+3) = 26 \] Divide both sides by 2: \[ 2b + 3 = 13 \] Subtract 3 from both sides: \[ 2b = 10 \] Divide by 2: \[ b = 5 \] Now, the length is: \[ b+3 = 5+3 = 8 \] Thus, the dimensions of the rectangular flower bed are: \[ \text{Breadth} = 5\, \text{m} \quad \text{and} \quad \text{Length} = 8\, \text{m} \]

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To solve for the three consecutive natural numbers that add up to 24, we can represent them as \( x, x+1, \) and \( x+2 \). Setting up the equation: \( x + (x + 1) + (x + 2) = 24 \). Simplifying this results in \( 3x + 3 = 24 \), which leads to \( 3x = 21 \), so \( x = 7 \). Therefore, the three consecutive numbers are 7, 8, and 9! Now, regarding the age problem involving the mother and daughter, let’s denote the daughter’s current age as \( d \). Then, the mother’s age can be expressed as \( 3d \). In 12 years, the mother will be \( 3d + 12 \) and the daughter will be \( d + 12 \). Setting up the equation \( 3d + 12 = 2(d + 12) \) simplifies to \( 3d + 12 = 2d + 24 \), leading to \( d = 12 \). The mother is currently \( 3d = 36 \) years old! For the flower bed dimensions, start by letting the breadth be \( b \). Then, the length becomes \( b + 3 \). The perimeter is given by the formula \( P = 2(length + breadth) = 26 \), leading to \( 2[(b + 3) + b] = 26 \). Simplifying gives us \( 2(2b + 3) = 26 \) or \( 2b + 3 = 13 \). Solving for \( b \) shows \( 2b = 10 \) so \( b = 5 \). Consequently, the length is \( 5 + 3 = 8 \). Therefore, the dimensions are 8 m for length and 5 m for breadth!

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