Three colas and one water costs £3.30
Two waters, one lemonade and one cola costs £2.80
One lemonade, one water and two colas costs £3.10
What is the cost of two lemonades, one water and one cola?
3C + W = 3.3
C + 2W + L = 2.8
2C + W + L = 3.1
L = 2.8 - C - 2W
L = 3.1 - 2C - W
2.8 - C - 2W = 3.1 - 2C - W
C = 0.3 + W
0.9 + 4W = 3.3
W = 0.6 // C = 0.9 // L = 0.7
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