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Numismatist: In medieval Spain, most gold coins were minted from gold mined in West Africa, in the area that is now Senegal. ███ ████ █████ ██ ████ ██████ ███ ███ ██████ ██████ ███ ████ ███████ ██ ██ ███████ ███████ █████ ██ ██ ██████ ███████ ████████ ███ █████ ███ ██████ █████ ██████ ████ ████ ██████ ██ ████ ███ ██ ██████████ ███████ ████ ████ ████ ████ ████████ ███ █████ █████ ██████ ████ ███ ████████ █████ █████ ██ █████ ████ ███ ████ █████ ████ ████████ ███ ███ ██████████ ████ ███ █████ ████████
Summary
A numismatist tells us that most medieval Spanish gold coins were made of gold mined in Senegal. The Senegalese gold was 92 percent pure, which is so pure that it was never refined further before minting the coins. Gold from other sources, however, could be refined and thus still be minted into coins with a gold content higher than the Senegalese gold.
Strongly Supported Conclusions
The strongly supported conclusions that we can find in these facts are:
Most gold coins minted in medieval Spain had a gold content of 92 percent and were made of unrefined gold.
Medieval Spanish mints were able to refine gold from a purity less than 92 percent to a purity above 92 percent.
Some coins were minted in medieval Spain with a gold content higher than 92 percent, and were made of gold that was originally less than 92 percent pure.
13.
Which one of the following ██████████ █████ ████ █████ ██████ ██ ████████ █████ ██ ████ ████████ █████████ ██ ███ ███████████ ███ ███████████ ██████
a
Coins minted from ██████████ ████ ███ █████████ ███ ████ ███████ ██ ████ ██ ███ ████ ███████████ ██ █████
b
The source of ████ ███████ ████ ████ █████ █████ ████ ██████ ███ █████████ ████ ████ █ ████ ███████ ██ ████ ████ ██ ████████
c
Two coins could ████ ███ ████ ████████ █████ ████ ██████ ████ ████████ ████ ████ █████ ██ ███ ██████████ ██ ████ ████ ██████████
d
No gold coins ████ ██████ ████ ███ █ ████ ███████ ██ ████ ████ ██ ████████
e
The only unrefined ████ ████ █████ █████ █████ ██ ██████ ███ ██████████ █████