Respuesta :

Answer:

8 in each box

Step-by-step explanation:

Step 1: 4x+5x=72

Step 2: Add 4x and 5x which is 9x, so 9x=72

Step 3: Divide both sides by 9. 72 divided by 9 is 8. So x=8

Conclusion: There are 8 granola bars in each box.