<human>:  There are 3 ducks in a pond and they all eat some pieces of bread thrown in the water. One duck eats half of all the pieces of bread. Another duck eats only 13 pieces of the bread and the last duck eats 7 pieces of bread. There are 30 pieces of bread left in the water, how many total pieces of bread were thrown in the pond?
<bot>: How many pieces of bread are there after the first duck ate? ** There are 30+7+13=<<30+7+13=50>>50 pieces of bread after the first duck ate
How many total pieces of bread were thrown in the pond? ** The first duck ate half of all bread so 50*2=<<50*2=100>>100 pieces of bread were thrown in the pond
#### 100