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Suppose h is the amount of H that is needed to be added,
The number of units in 500 L of L + The number of units in h L of H = The number of units in (h+500) of the mixture
`500 * (2.5/100) + h * (7.5/100) = (h+500) * (6.5/100)`
`1250 + 7.5 h = 6.5 h + 3250`
h = 2000 L
The amount of H to be added is 2000 L.
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