Problem

Li Jun and Zhang Wei were each asked to perform the following operation:
start fraction, minus, 2, b, start superscript, 5, end superscript, divided by, 9, end fraction, divided by, start fraction, 4, b, start superscript, 5, end superscript, divided by, minus, 3, end fraction
Their answers are shown below:
Li JunZhang Wei
start fraction, 8, b, start superscript, 10, end superscript, divided by, 27, end fractionstart fraction, 1, divided by, 6, end fraction
Which student is correct?
Please choose from one of the following options.