60 percent of 70 is the same as 40 percent of what number?
A) 98
B)103
C)105
D)108

The half-life of a certain material is 0.002 second. approximately how much of a 14-gram sample will be left after 0.004 second? a. 12 grams b. 3.5 grams c. 0.06 gram d. 7 grams