If the original mass of an element, in grams, is a whole number and the element has decayed by exactly 93 percent in some time period, which of the following could be the final mass of that element?
Answers:
A) 27 grams
B) 21 grams
C) 29 grams
D) 31 grams
E) 32 grams
Let original mass be 100   The final mass of that element will be 7   So whatever option we have it will be divisible by 7   Check for the options the one that doesn't produce non terminating decimal is our answer   A. 27 grams   27/7 = 3.857...   B. 21 grams   21/7= 
<gadget id="calculator">21/7</gadget>
<output>3</output>
3   C. 29 grams   29/7= 4.142.......   D. 31 grams   31/7 = 4.428.....   E. 32 grams   32/7 = 4.571....   Hence our answer will be (21 grams)
<result>B</result>
If the original mass of an element, in grams, is a whole number and the element has decayed by exactly 93 percent in some time period, which of the following could be the final mass of that element?