Answer:
c
Step-by-step explanation:
30% of 60=(3)(6)
35.75
explanation-
3.90 ph x 7.5 hours = 29. 25
plus the gas can 6.50
29.25+6.50= 35.75
So 5 liters of natural for every 7 synthetic, so 5 / 12 liters are natural oil.
so; 684 × (5/12) = 285 liters of natural oil
Hope this helps!
He worked on the car for 4 hours. 35+7+7+7+7=63.