Math Problem Statement

Amila, Babu and Christy earn a total of Rs. 970 per week as the take home salary. Amila's take home salary plus twice each of the other's is Rs. 1640. Christy's take-home salary plus twice each of the other's is Rs. 1600. Using the matrices, find the take home salary of each.

Solution

Let the take-home salaries of Amila, Babu, and Christy be denoted by AA, BB, and CC respectively.

System of Equations:

We can translate the given information into the following system of equations:

  1. The total salary: A+B+C=970A + B + C = 970

  2. Amila's salary plus twice each of the others: A+2B+2C=1640A + 2B + 2C = 1640

  3. Christy's salary plus twice each of the others: C+2A+2B=1600C + 2A + 2B = 1600

Step 1: Matrix Representation

We can represent this system of equations as a matrix equation AX=BAX = B, where:

1 & 1 & 1 \\ 1 & 2 & 2 \\ 2 & 2 & 1 \end{pmatrix} \begin{pmatrix} A \\ B \\ C \end{pmatrix} = \begin{pmatrix} 970 \\ 1640 \\ 1600 \end{pmatrix}$$ ### Step 2: Solving the Matrix Equation Now, we will solve this system of equations using the matrix method. I'll calculate the solution.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Matrix Algebra

Formulas

System of linear equations: A + B + C = 970, A + 2B + 2C = 1640, 2A + 2B + C = 1600
Matrix equation: AX = B

Theorems

Matrix inversion theorem
Cramer's rule

Suitable Grade Level

Grades 9-12