<PRE><B>Question 424156</B>
If Petrolyn oil is a combination of natural oil and synthetic oil-5 parts natural for evry 4 parts of synthetic oil.
 How many liters of synthetic oil are contained in 468 liters of petrolyn oil?
:
:
Synthetic oil is 5/9 of the total 
:
{{{5/9}}} * 468 = 260 liters of syn oil in 468 liters
:
Check this; natural oil is 4/9 of the total
{{{4/9}}} * 468 = 208 liter
:
Total: 208 + 260 = 468, confirms our solution of 260 liter of Syn oil</PRE>