"m_w" =water mass
"m_t" = total mass
"(30+m_w) = m_t \\\\\n\nm_w = 0.25m_t \\\\\n\n30 + 0.25m_t = m_t \\\\\n\n30 = 0.75m_t \\\\\n\nm_t = 40 \\;kg"
40 kg of the air-dry soil should be weighed into the pot.
"m_w = 0.25 \\times 40 = 10 \\;kg"
10 kg of that is moist
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