Van distances - back = 110 km (Van 7 km / L)
L = l (from the 15.71 110 / 7 = 15.71)
if oil prices. At present, is 30.71)
charged water it = number of fuel (L) x oil
= 15.71 x 30.71
= 482.45)
.Therefore, the fuel car - back about 482.45 baht.
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