If you're good at arithmetic, can you work this out please?

[Justmuddlingalong]

If I've to dilute 15ml of concentrate with 4.5 litres of water, how much concentrate is needed for 200ml? 🤯

O.6667 ml

15 ml in 4500 ml
4500/15 *200

You, @DuchessOfSausaage are a star!

(200/4500)x 25= 0.667ml (about 13 drops of a water-like liquid.

Thank you, @Justmuddlingalong . I was a bit wary of answering as my arithmetic isn't great.