Problem: A chemist has m​ ounces of salt water that is m% salt. How many ounces of salt must he add to make a solution that is 2 m% salt?
Answer Choices:
A. 100+mm​
B. 100−2m2m​
C. 100−2 mm2​
D. 100+2 mm2​
E. 100+m2 m​
Solution:
m+x100m2​+x​=1002m​∴x=100−2mm2​