stupid 5th grade math problem causing issues

Hi,
this is nuts... the husband and I are disagreeing on how to workt his out for the kiddo. How would you work out this problem? Obviously we know she spent 10 dollars, but we cannot agree on how to come up with the fractions.Writing in Math:Jacqueline has four
$5 bills. She bought a shirt for$ 10. She spent half of her money. explain how much money Jacqueline spent. Use Equivalent fractions.clarification: one of us wants this to be 20/1  10/1 = 10/1, the other is saying that's not what equivalent fractions are, so it should be 10/20 = 1/2help?
Please help.
I didn't find the right solution from the Internet.
References:
https://arstechnica.com/civis/viewtopic.php?f=23&t=1124368
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Thanks!