In 2008 gasoline in india costs 29.9 rupees per liter. What is the cost of a gallon of gasoline in U.S. dollar per gallon? There are 42.7 indian rupees per U.S. dollar.

calculat the volume, in L, of 34 Kg of carbon tetrachloride ( d = 1.59 g/mL ).

1 L -> ? Gallon
? Gallon -> R 29.9
1 gallon -> 29.9/?

R 42.7 -> $ 1
R 1 -> 1/42.7
R 29.9/? -> $??

This is just proportions.


For the second part:
Density = \frac{Mass}{Volume}

Substitute the values that you have.