A pharmacist has 2 hectograms 55 grams of pills. Each pill weighs 1 gram 2 centigrams. How many pills does the pharmacist have altogether?
A. 205
B. 250
C. 255
D. 350
I came up with B. 250
We can "logic" this one out, but it makes things a lot easier if we know that hecto is the metric prefix for 100. See here.
However, we know that hecto IS a metric prefix, so it must be some multiple of 10. Thus the pharmacist has 2*10^n + 55 grams, where n is some integer. The only number of that form is answer C, 255.
-Dan