Triangular numbers puzzle

Triangular numbers puzzle
Sam works in a supermarket stacking cans of beans. The beans are delivered in boxes of 49 and Sam has to arrange them in triangular stacks. One day, he finds that he can arrange 49 cans into 3 triangular stacks. Can you work out how Sam did this? Is there a second way of doing it?
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Key stage: Year 6, 11+, KS2