Answer:
64.80
Step-by-step explanation:
Sathish is alone for 150 at the beginning and 150 at the end for 300 km
2100 - 300 = 1800
He shares the trip with his 2 friends for 1800 km
We will use ratio to determine the gas need for this part of the trip
100 km 1800 km
---------- = ------------
6 liter x liters
Using cross products
100x = 1800*6
100x =10800
Divide each side by 100
100x/100 = 10800/100
x = 108 liters
It costs 1.2 per liter
108*1.2 =129.6
But this is divided by 3 (Sathish and his 2 friends)
129.6/3 =43.2
Now we need to find how much for his solo part
100 km 300 km
---------- = ------------
6 liter x liters
100x = 6*300
100x = 1800
Divide by 100
100x/100 =1800/100
x = 18
It costs 1.2 per liter
18*1.2 =21.6
Add his two costs together
43.20+21.60 =64.80
