His parakeets eat 6 grams a day, because three parakeets times two grams each equals 6 grams.
His parrots will eat 28 grams a day because two parrots times 14 grams equals <<2*14=28>>28 grams.
Each finch will eat 1 gram a day, because they eat half of what a parakeet does and 1/2 of 2 equals one.
His finches will eat 4 grams a day because four finches times 1 gram equals 4 grams.
His birds eat 38 grams a day because 6 plus 28 plus 4 equals <<6+28+4=38>>38
Each week has 7 days
Therefore, in a week he will need 266 grams because 7 times 38 equals <<7*38=266>>266.
#### 266