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75 × (x-0) = 25 × (100-x)
75x = 2500 - 25x
100x = 2500
x = 25
m × C × /\t = m × C × /\t
75 × 1 × (tc-0) = 25 × 1 × (100-tc)
75tc = 2500 - 25tc
75tc + 25tc = 2500
100tc = 2500
tc = 2500 / 100
tc = 25