A human body had 30 times as many platelets as white blood cells. A small sample of blood has 8*10'3 white blood cells. About how many platelets are in the sample?

To determine the number of platelets present in the human body, we need a relation that would relate this value to the given value above which is the number of white blood cells. Fortunately, we are given a ratio of 30. So, we use this value as follows:

number of platelets/number of white blood cells = 30

number of platelets / 8*10^3 white blood cells = 30

number of platelets = 240000