A jar contains a mixture of a fruit juice and water in the ratio 5:x. When 1 litre of water is added to 4 litres of the mixture the ratio of fruit juice to water becomes 1:1. What is the value of x ?

Q: A jar contains a mixture of a fruit juice and water in the ratio 5:x. When 1 litre of water is added to 4 litres of the mixture the ratio of fruit juice to water becomes 1:1. What is the value of x ?