Question

John wants to buy something for himself with his pocket money. He has a budget of $105 to spend on $25 T-shirts, $10 CDs, and $5 books. He wants to buy 10 items and wants to buy as many books as T-shirts and CDs combined. Using MATLAB, how many of each item should he buy? Write a system of equations to help you solve this problem.

Please include everything that must be typed in to accomplish this

Answer #1

Given that,

system of equations:

let,

x = number of T-Shirts bought,

y = number of CDs bought,

z = number of books bought

Given that,

total money spent = $105, so , the first equation is :

25x + 10y + 5z = 105

Then, total number of items bought is 10, the second equation is:

x + y + z = 10

Then. number of books(z) = number of CDs and T-Shirts combined(x+y). The equation is:

x + y - z = 0

Now, we have the system of linear equation, we will solve it using the backslash \ operator

**program**:

%System of equations:

%25x + 10y + 5z = 105 : A total of $105 spent

%x + y + z = 10 : A total of 10 items bought

%x + y - z = 0 : number of t-shirts + CDs = number of books

A = [25 10 5; 1 1 1; 1 1 -1];

b = [105; 10; 0];

X = A\b;

fprintf('Number of T-shirts: %d\n', X(1))

fprintf('Number of CDs: %d\n',X(2))

fprintf('Number of books: %d\n',X(3))

**output**:

Number of T-shirts: 2.000000e+00

Number of CDs: 3.000000e+00

Number of books: 5

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