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“How many plant species are there?” It was of course my old friend professor Brainstrain who asked this. His nephew looked bewildered.
“10? No, more”, he thought. Then he asked: “over a hundred, maybe?”
“Many more,” the professor asked with a smile.
He went on:
“In the following addition, every digit had been replaced with a letter. Find the original sum.
You can check your solutions here
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