Given that,
Bottles of lemonade usually contain 500 ml.
A bottle with a special offer states 20% extra free.
To find,
The amount of lemonade in bottle with the special offer.
Solution,
Total quantity in the bottles = 500 mL
With 20% of special offer, we can find it as follows :
[tex]x=500+500\ \text{of}\ 20\%\\\\=500+500\times \dfrac{20}{100}\\\\=500+100\\\\=600\ mL[/tex]
So, with special offer, the total amount is 600 mL is in bottle.