Question

the ratio of the weight of an object on Planet A to the weight of the same object on planet B is 100 to 3. If an elephant weighs 2900 pounds on Planet A, find the elephants wight on planet B.

Answer 1

You can set up a ratio:
$\frac{object weight on A}{object weight on B} = \frac{elephant weight on A}{elephant weight on B}$
By substituting in the numbers, you get:
$\frac{100}{3} = \frac{2900}{x}$
$(\frac{100}{3}) * x = (\frac{2900}{x}) * x$
$\frac{100x}{3} = 2900 \\ (\frac{100x}{3}) * 3 = 2900 * 3$
100x = 8700
100x / 100 = 8700 / 100
x = 87 pounds

Hope this helps! :)