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Perimeter unshaded: 10-x+10+10+y
Perimeter shaded: x+y+10
Difference: -2x+20=12, so x=4
Area shaded A=(10*x)/2=20
Well done!
If I remember correctly, you homeschool your children? Do you teach them algebra when they were/are in elementary school?
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24 sats \ 1 reply \ @Scroogey 13h
You mean based on #819532?
No, I don't. I have a child in (public) secondary school now. I'm helping with math homework and test preparation.
It has been harder than I initially imagined, and sometimes frustrating, because of how different they teach math now compared to my own childhood. Instead of mastering one thing at a time, then building on top of that with the next, now they always do multiple new things at the same time, then re-iterating over topics later (trusting it will eventually sink in). Sometimes it's tricky for me to even understand the tasks, due to new language invented.
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Thank you for sharing. I admire your conviction
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