Simplify rational expressions: common monomial factors

Problem

Yanis and Shota manipulated the rational expression start fraction, 16, z, start superscript, 2, end superscript, minus, 40, z, divided by, 24, z, start superscript, 2, end superscript, minus, 40, z, end fraction. Their responses are shown below.
YanisShota
start fraction, 16, z, start superscript, 2, end superscript, divided by, 24, z, start superscript, 2, end superscript, end fractionstart fraction, 2, z, minus, 5, divided by, 3, z, minus, 5, end fraction
Which student wrote an expression that is equivalent to the original expression?
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