The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune?. A) 107 1/7 pounds. B) 170 pounds. C) 210 pounds. D) 750 pounds

5/7 = 150/x

5x = 1050

x = 1050/5

x = 210 lbs <===

The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7

So,

We can use proportions to find out the weight of a person on Neptune.

Lets start:

E refers to Earth

N refers to Neptune

Therefore,

E:N = 5:7

Converting them into fractions:

E/N = 5/7

Substituting the value of weight on earth.

150/N = 5/7

Solving for N.

5 N = 150 x 7

5 N = 1050

N = 1050/5

N = 210 pounds.

Hence, the right answer is option:

C) 210 pounds.