I had an exam today (Egyptian GSEC english exam) and in a passage about library it said:
The book slipped from his hands and fell on the floor with loud noise, 20 eyes looked up at him and his face turned red.....
It then asked: approximately,how many persons where at the library?
Natural English is this . The book slipped from his hands and fell on the floor with a loud noise . .
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Natural English is this. The book slipped from his hands and fell on the floor with a loud noise . . .
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20 eyes probably means 10 people. If you mean 20 people, you'd usually say '20 pairs of eyes'.
Note that this is a trick question. Don't forget to count the per