Drying herbs

Herbs lose 75% weight By drying. How many fresh herbs do you have to collect if you want to make 1.5 kg of dried herbs?

Correct result:

x =  6 kg

Solution:

$$\begin{gathered} x-75\mathrm{/}100x=1.5 \\ x-75\mathrm{/}100\cdot x=1.5 \\ 25x=150 \\ x=6=6\text{ kg} \end{gathered}$$

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