Question

The ratio of the weight of an object on Jupiter to its weight on Earth is 8 to 3. How much would a 100 pound person weigh on Jupiter?

Answer 1

$\frac{x}{100} = \frac{8}{3}$ ⇒ x=$\frac{100*8}{3} = \frac{800}{3} = 266,(6)$

Answer 2

If 8 = 3  (consider 8 to be and 3 to be earth (proportional))
then x = 100 (cross multiply)
x × 3 = 8 × 100
3x = 800
3x /3 = 800 / 3
x = 266.67   (this rounded to two decimal places)
therefore a person who weighs 100 pounds on earth would weigh 266.67 on jupiter