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The difference between two numbers is 14 and the difference between their squares is 448. Find the numbers.

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To solve the problem step by step, we will define the two numbers and set up equations based on the information given in the question. ### Step 1: Define the variables Let the two numbers be \( x \) and \( y \). ### Step 2: Set up the equations According to the problem, we have two pieces of information: 1. The difference between the two numbers is 14: \[ x - y = 14 \quad \text{(Equation 1)} \] 2. The difference between their squares is 448: \[ x^2 - y^2 = 448 \quad \text{(Equation 2)} \] ### Step 3: Use the difference of squares We can use the identity \( a^2 - b^2 = (a - b)(a + b) \) on Equation 2: \[ x^2 - y^2 = (x - y)(x + y) \] Substituting Equation 1 into this gives: \[ 448 = (14)(x + y) \] ### Step 4: Solve for \( x + y \) Now, we can solve for \( x + y \): \[ x + y = \frac{448}{14} = 32 \quad \text{(Equation 3)} \] ### Step 5: Solve the system of equations Now we have a system of two equations: 1. \( x - y = 14 \) (Equation 1) 2. \( x + y = 32 \) (Equation 3) We can add these two equations: \[ (x - y) + (x + y) = 14 + 32 \] This simplifies to: \[ 2x = 46 \] So, \[ x = \frac{46}{2} = 23 \] ### Step 6: Find \( y \) Now, substitute \( x = 23 \) back into Equation 1 to find \( y \): \[ 23 - y = 14 \] This simplifies to: \[ y = 23 - 14 = 9 \] ### Conclusion The two numbers are: \[ x = 23 \quad \text{and} \quad y = 9 \]

To solve the problem step by step, we will define the two numbers and set up equations based on the information given in the question. ### Step 1: Define the variables Let the two numbers be \( x \) and \( y \). ### Step 2: Set up the equations According to the problem, we have two pieces of information: 1. The difference between the two numbers is 14: ...
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RS AGGARWAL-LINEAR EQUATIONS IN TWO VARIABLES -Exercise 3E
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  3. The difference between two numbers is 14 and the difference betwee...

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  4. The sum of the digits of a two-digit number is 12. The number obtained...

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  5. A number consisting of two digits is seven times the sum of its dig...

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  6. The sum of digits of a two digit number is 15. The number obtained ...

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  7. A two-digit number is 3 more than 4 times the sum of its digits. If 18...

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  8. A number consists of two digits. When it id divided by the sum of i...

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  9. A two-digit number is such that the product of its digits is 35. ...

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  10. A two digit number is such that the product of its digits is 18. When ...

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  11. The sum of a two digit number and the number obtained by reversing the...

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  12. The sum of the numerator and denominator of a fraction is 8. If 3 i...

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  13. If 2 is added to the numerator of a fraction, it reduces to 1/2 and if...

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  14. The denominator of a fraction is greater that its numerator by 1...

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  15. In a given fraction, if 1 subtracted from the numberator and 2 ...

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  16. The sum of the numerator and denominator of a fraction is 4 more th...

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  17. The sum of two numbers is 16. The sum of their reciprocals is 1/3. Fin...

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  18. There are two examination rooms A and B. If 10 candidates are sent A a...

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