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Pimpim and Orphée are strolling on the beach. They stop to build a sand castle. Pimpim says :
- With my 1 791 405 grains of sand I can build 3 towers for our castle.
Orphée replies :
- We need 5 towers !
How may grains of sand must Pimpim gather in addition to what he already has ?
grains of sand
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