Eli’s can ride his scooter 128 miles on one tank of gas. If the scooter has a 4-gallon gas tank, how far can Eli ride on one gallon of gas?

A
512 miles per gallon
B
20 miles per gallon

C
32 miles per gallon
D
64 miles per gallon

Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.

X=-4  is the answer i think