Answer:
7 quarters
Explanation:
We know that for every quarter, Reggie would receive 50 food pebbles, we also know that he has thrown 350 food pebbles into fish pools. So let's create an equation, q is for the quarters.
50(q) = 350
Since every quarter gives Reggie 50 food pebbles, then the q variable will go next to 50, and since we need to reach the total amount of 350, we put it on the opposite side.
Solve for q by isolating it, divide 50 from both sides:
Therefore, Reggie used 7 quarters for 350 food pebbles.