Question

if 15 lbs of food feeds 200, how many lbs will it take to feed 125? I cant remember how to figure this one out

Answer 1

fraction and proportion

Answer 2

thank you havent had to use this in many many years

Answer 3

15/200 -x/125

Answer 4

cross multiply

Answer 5

\[\frac{15 \text{ lbs}}{200 \text{ people}}=\frac{x \text{ lbs}}{125 \text{ people}}\]
to find x, multiply both sides of the equation by 125:
\[\frac{15 \text{ lbs}}{200 \cancel{\text{ people}}}\cdot 125 \cancel{\text{ people}}=\frac{x \text{ lbs}}{\cancel{125 \text{ people}}}\cdot \cancel{125 \text{ people}}\]
this simplifies down to
\[x \text{ lbs}= \frac{15\cdot 125}{200}\text{ lbs}= 9\frac{3}{8} \text{ lbs}\]