A jug has 400 mL of 1/2 strength orange

juice. The following amounts of full-strength
juice are added to the mix. Find a fraction
to describe the strength of the orange drink
after the full-strength juice is added

a) 100 mL

I don't get what this question is trying to ask for.

4 answers

400 mL of 1/2 strength juice contains 200 mL of juice

Adding 100 mL of juice makes 500 mL containing 300 mL juice, or 60% juice.
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There was 4.5 L of juice in the big jug. Farah drank 235mL of juice, John drank 450 mL of juice, and Grace drank 0.25 L of juice. How much juice was left in the jug?