Question

The ratio of an object's weight on Earth to its weight on Venus is 8:7. How much would a woman who weighs 120 pounds (lbs) on Earth weigh on Venus?

Answer 1

She would weigh 105 pounds on Venus.
120 divided into 8 groups will equal 15.
Then subtract 15 from 120 to get 105 pounds.
Now there are 7 groups of 15 when she is on Venus and 8 groups when she is on Earth. That is where the ratio is used.