science
posted by amor on .
If the halflife of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain
A.6 minutes
B.24 minutes
C.48 minutes
D.96 minutes
I NEED HELP!!!!

IS IT.....C?

5g is 1/4 of 20g, so that's 2 halflives
2x24 = 48 minutes, so you are correct. 
Hey! That's just what I'm trying to figure out! Maybe you ca help me!

i think its c but i'm not sure science is not my strong suit. this one is difficult.

Its c

i realy dont know