The problem of calculating the number of birds, 'knocked out' 4 contestants of Road to Olympia

In the finishing round, the organizers of Road to Olympia asked contestant Bao Phu the following question:

"Bird A was flying when he met a flock of birds B flying in the opposite direction, so he said: "Hello, my friend". The leader bird replied: "Hello, we are not 100, but all of us, plus all of us, plus half of us, then plus a quarter of us and you, that makes 100". How many birds are there in flock B?"

The question was worth 30 points, but contestant Bao Phu could not give the correct answer. Due to time pressure, the other three contestants could not give the correct answer either.

The problem of calculating the number of birds 'knocked out' 4 contestants of Road to Olympia.

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Lam Hoang

Source: https://vtcnews.vn/bai-toan-tinh-so-chim-danh-guc-4-thi-sinh-duong-len-dinh-olympia-ar942044.html