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2 large + 3 small = 5.1L
Assuming 1 large = 1.5L,
1 small = [5.1 - (1.5*3)] / 3 = 0.7L
When filling large bottle, she needs 0.6L more. 1.5L - 0.6L = 0.9L (which means, she only filled up 0.9L of lemonade)
Total lemonade she made = 5.1L +0.9L = 6L
OR
When filling small bottle, she left 0.2L.
5.1L+0.7L+0.2L = 6L
Assuming 1 large = 1.5L,
1 small = [5.1 - (1.5*3)] / 3 = 0.7L
When filling large bottle, she needs 0.6L more. 1.5L - 0.6L = 0.9L (which means, she only filled up 0.9L of lemonade)
Total lemonade she made = 5.1L +0.9L = 6L
OR
When filling small bottle, she left 0.2L.
5.1L+0.7L+0.2L = 6L
Thanks