MATH
posted by DJ .
Carmen spent 4 hours at the Y on Saturday. Two thirds of that time she spent in the gym. How many hours did she spend in the gym?

(2/3) of 4 = ?

: A box contains two black balls and three gold balls. Two
balls are randomly drawn in succession from the box.
a. If there is no replacement, what is the probability
that both balls are black?
b. If there is replacement before the second draw, what
is the probability that both balls are black? 
Please don't post a new question as part of somebody else problem & replies, it was just lucky I looked back at this one.
a) Prob(two blacks) = (2/5)(1/4) = 1/10
b) now it would be (2/5)(2/5) = 4/25