Question

copy central prints black and white or colored copies. Yesterday, they printed 9 black and white copies for every 2 colored copies. If they printed 200 color copies, how many black and white copies were printed

Answer 1

`\bf \cfrac{bw}{color}\qquad 9:2\qquad \cfrac{9}{2}\qquad \qquad \cfrac{bw}{200}=\cfrac{9}{2}\implies bw=\cfrac{200\cdot 9}{2}`

Answer 2

900.

Explanation:

We have been given that copy central prints black and white or colored copies. Yesterday, they printed 9 black and white copies for every 2 colored copies.

We will use proportion to solve the given problem as:

`\frac{\text{Black and white copies}}{\text{Colored copies}}=(9)/(2)`

Substitute the given values:

`\frac{\text{Black and white copies}}{200}=(9)/(2)`

`\frac{\text{Black and white copies}}{200}*200=(9)/(2)*200`

`\text{Black and white copies}=9*100`

`\text{Black and white copies}=900`

Therefore, 900 black and white copies were printed.