Jo has a gerbil and a German Shepard. the shepherd eats 14 times as much food as the gerbil. altogether, they eat 225 ounces of food does the German shepherd eat per week?

First, lets represent

the gerbil eats 1 food unit

the german shepard eats 14 times of gerbil or 14 food units

together they eat 225 oz per week so

gerbil=1food unit

german shepard=14 food unit

add them together

gerbil+german shepard=15 food unit

15 food unit=225 oz

divide both sides by 15

1 food unit=15 oz

we want to find 14 food unit

15 oz times 14=210 oz

the german shepherd eats 210 oz per week