Evelyn has 80 pens in a drawer. 15 pens are black and the other pens are blue.
Evelyn picks a pen at random from the drawer.
(a) What is the probability that Evelyn picks a black pen?
(b) What is the probability that Evelyn picks a blue pen?

there is a 15/80 chance  she will pick a black pen

there is also a 65/80 chance she will pick a blue pen

Step-by-step explanation:

answer: c. positive form.

step-by-step explanation:

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.