In a mixture of 80 litres of orange juice and soda, the amount of soda is 30 litres. How many litres of soda should be added to make the ratio of juice to soda 1:2?
70 L
The mixture contains 80 litres total, with 30 litres of soda, so the juice quantity is \(80 - 30 = 50\) litres.
Let \(x\) litres of soda be added so the ratio of juice to soda becomes 1:2.
This gives \(\frac{50}{30+x} = \frac{1}{2}\), so \(100 = 30+x\).
Solving, \(x = 100 - 30 = 70\).
Hence, the answer is 70 L.
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