Question

a hydroelectric plant uses water to create electricity. before water enters the plant, it passes through two filters. engineers found a total of 608 pieces of litter in the filters. there were 261 pieces of litter in the first filter. how many pieces of litter were in the second filter?

Explanation:

Step1: Identify the total and first - filter amount

The total amount of litter in the two filters is 608 pieces and the amount in the first filter is 261 pieces.

Step2: Calculate the amount in the second filter

We use subtraction. Let the amount in the second filter be $x$. Then $x=608 - 261$.
$x = 347$

Answer:

347 pieces of litter