Answer:
3/10 liter
Step-by-step explanation:
Assuming your description means that 4/3 liters of punch includes 2/5 liters of water, then the fraction of punch that is water is ...
(2/5)/(4/3) = (2/5)(3/4) = 3/10
3/10 of a liter of water is used in each liter of punch.
4025
3500×0.15=525
3500+525= 4025
x = 41
x-23=18
Add 23 to each side
x-23+23=18+23
x =41