How many apartment buildings are needed to house 3000 people if each building can house 150 people?

So this is what you need to do,

If we have 3000 people and 150 can fit into one house, you need to divide.

3000 / 150 = 20..

There will be 20 apartment buildings.

To make sure it is correct, do 150 * 20. That is 3000.

:)

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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