A fruit juice blend is made by mixing the juice of oranges and apples in the ratio 7:5 . If 168 litres of orange juice is used , how many litres of apple juice must be used ?
To find the amount of apple juice needed, we need to find the ratio of orange juice to apple juice.
Given that the ratio of orange juice to apple juice is 7:5, we can set up the equation:
7/5 = 168/x
Cross-multiplying, we get:
7x = 168 * 5
Simplifying this, we get:
7x = 840
To solve for x, we divide both sides of the equation by 7:
x = 840 / 7
Simplifying this, we get:
x = 120
Therefore, 120 litres of apple juice must be used.