1. Muammo: 42 foiz 672 ga teng bo'lgan sonni toping. 2. Formulani eslatib o'tamiz: foizni son sifatida ifodalash uchun foizni 100 ga bo'lamiz. Ya'ni, $42\% = \frac{42}{100} = 0.42$. 3. Muammo shunday: $0.42 \times x = 672$. 4. Endi $x$ ni topish uchun tenglamani $x$ ga nisbatan yechamiz: $$x = \frac{672}{0.42}$$ 5. Hisoblaymiz: $$x = 1600$$ 6. Demak, 42 foizi 672 ga teng bo'lgan son $1600$ ga teng.