Answer:
5=3+2
7=5+2
9=7+2
so this is 3,5,7,9
Step-by-step explanation:
To know how many liters of water Bao use per liter of flour we have to divide the liters or flour so:

So Bao uses 0.33 or 1/3 of water per liter or flour
and to know hoy manu liters of flour Bao use per liter of water we have to made the oposite division so:

She use 3 liters of flour per liter of water
Look at attached photo
first divide each line into the number as shown in the denominator
Hello There!
.84 ÷ .02 ≈ 42
WORK SHOWN IN IMAGE ATTACHED