Кусок мыла

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Эта задачка для решения в уме:

На одну чашку весов положили кусок хозяйственного мыла, на другую чашку положили три четверти такого же куска и ещё 100 граммовую гирьку, после чего весы уравновесились. Сколько весит кусок мыла?

Ответ: