Answer

Every time that Gerard puts a quarter inside the pellet machine, the machine dispenses 10 pellets:

Means for every quarter we get 10 pellets: 25c---- 10 pellets.

If he puts 4 quarters:

First quarter--- 10 pellets

Second quarter--- 10 pellets

In total by puting 2 quarters we get 10+10 = 20 pellets.

Third quarter--- 10 pellets

In total by puting 3 quarters we get 10 + 10 + 10 = 30 pellets.

Finally by puting the forth quarter we get another 10 pellets.

The final total of pellets that he fed the goats will be:

10 + 10 +10 +10 = 40 pellets.

10 pellets for each 25c.