Please help answer number 18.

First of all, we need to know that:

From the problem, we know that:

Converting gallon to quarts:

For Angela:

For Ryou:

Number of blue walls:

So we can paint 3 walls.

Number of white walls:

So we can paint just one wall.

For blue paint:

We can solve this by a rule of three as follows:

For white paint:

We can solve this by a rule of three as follows:

answer: she must produce at least 9,000 windows in order to make a profit of $48,000

explanation:

48,000 - 12,000 = 36,000

36,000/4 = 9,000