Well, a bee weighs between 90 and 180mg [answers.com], I'll just assume 100mg on average. That makes for a combined weight of 25M*0.1g = 2.5Mg = 2.5t
When all 25 million bees take of, they reduce the lorry's weight by 2.5 tonnes? Whoa.
But wait! The lorry is closed at the bottom,
No change in weight after all, as the downward pressure from their wings should equal their mass as they hover around
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