1) Carlos and Nathan ate lunch together in a park bench. At 1:00p.m., they left the bench and walked in different directions. By 1:05p.m., Carlos and Nathan were 60 meters apart. If they each continued walking in a straight line at the same speed as before, how far apart will they be at 1:20pm?

Question

(I got 180 meters?)

2) A box contains 6 yellow pencils, 6 blue pencils, 8 black pencils, and 4 green pencils. One pencil is removed at random and not looked at, then another, and so on. How many pencils must be removed to be certain that at least one green pencil is taken?

(I don't know)

3)

9< 2^n < 36

How many different integer values of n satisfy the inequality above?

(I got 2?)

Answer 1

#1 they will be 240m apart. 60m per 5 min
They would be 180m farther apart than they were at 1:05

#2 There are 20 pencils which are not green.
So unless you take 21, you cannot be sure of a green.

#3 ok

Answer 2

Thank you!!