Question

Kinu has 7 memory sticks that contain data from his computer. Some of the me
megabytes (MB), and the rest have a capacity of 512 MB. The total capacity of
system of equations shown can be used to calculate x, the number of 128 MB
512 MB memory sticks.
x + y = 7
128x + 512y = 2432

Answer 1

Solving the system of equations, it is found that x = 3, that is, there are 3 128 MB memory sticks.

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We want to solve for x, thus, in the first equation, we write y as a function of x, that is:

$y = 7 - x$

Replacing in the second equation:

$128x + 512(7 - x) = 2432$

$128x + 3584 - 512x = 2432$

$384x = 1152$

$x = \frac{1152}{384}$

$x = 3$

x = 3, that is, there are 3 128 MB memory sticks.

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