A company selling cell phones has a total inventory of 900 phones. Of these phones, 450 are smartphones and 270 are black. If 225 phones are not black and not a smartphone, how many of the phones are black smartphones

45 of the phones are black smartphones.

Step-by-step explanation:

We sould this question treating these probabilities as Venn events.

I am going to say that:

Event A: Smartphone.

Event B: Black.

450 are smartphones and 270 are black.

This means that .

225 phones are not black and not a smartphone

This means 900 - 225 = 675 are either black or a smartphone, that is,

How many of the phones are black smartphones?

This is:

Considering the values we found:

45 of the phones are black smartphones.