Your doctor told you to eat 25 grams of fiber each day. you had 44 grams of fiber for breakfast. what percent of the 25 grams of fiber have you eaten so far?

The question given above may be answered through the concept of ratio and proportion. The ratio of the man's weight on Earth and Mars should be equal to the ratio of the rock's weight on Earth and Mars. By letting x be the rock's mas on Earth, the equation that would best represent the situation is,
                          180 / 72 = x / 16
The value of x is equal to 40. Thus, the rock weighs 40 pounds on Earth.