Can anyone explain this question as I can’t able to understand the 5lb explanation?

let us assume that there are x monsters at the convention.

2/5x do not have horns, which means 3/5x have horns.

So 3/5x = 1/7x + 1/3x + 26 (having horns)

Simplifying this, we get 13/105x = 26

so, x = 210

Thank you so much @bhowmickkaran

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