During 18 months' work on 12 farms, they found a third more species of parasitic wasp than are known to exist in the whole country of Costa Rica.
What does "a third more" mean? It means all of them together would be four fourth?
jaleh What does "a third more" mean? It means all of them together would be four fourth? No.
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jalehWhat does "a third more" mean? It means all of them together would be four fourth?
No.
The species they found amounted more than one-third of the species (parasitic wasp) that already existed in the whole of Costa Rica.
Let's assume 300 species of wasp are known to exist in the whole country of Costa Rica.
During 18 months' work on 12 farms, they found 400 species of parasitic wasp.
[ ie 300 + one third of 300 ]
Clive