Kevin and Amy are working on an experiment in the science lab. They start with 2.3 grams of oil and add water
to get exactly 4.21 grams of solution. To find the amount
of water added, they subtract the weight of the oil from the
weight of the solution. Kevin calculates the difference to
be 3.98 grams; Amy calculates it to be 1.91 grams.
Who is correct, and why?
4.21
4.21
Kevin -2.3 Amy -2.30
3.98
1.91
A. Amy is correct. Kevin did not regroup properly