Matt and elaine, working together can paint a room in 3h. It would take matt 5h to paint the room by himself. How long would it take Elaine to paint the room by herself?

3×5=15

Step-by-step explanation: its saying HOW which means to multiply..

Step-by-step explanation:

*Whatever you do to one side of the equal sign you must do to the other!

2. Get rid of the constant(Notice the negative sign beside the 18. This means you add to get to 0)

3. Separate the number from the variable by dividing because 4x= 4 times x. You must do the inverse operation to get rid of the 4. (Inverse of addition is subtraction, Inverse of subtraction is addition, Divisions multiplication and multiplications division)

Since 4 doesn't go into 30 evenly, I chose to keep it as an improper fraction. If you'd prefer mixed number: 7 2/30

Sorry if it's confusing! Hope I helped! :)