The allies' strategy in europe was to a. attack from island to island. b. retreat from germany. c. set up defense lines in the hills of rome. d. advance into germany from all directions. save

Wei can purchase 300 balloons.

The model used for the problem is .

Step-by-step explanation:

Let the number of white balloons = x

The cost of blue balloons and white balloons are 60 cent = $0.6 and 30 cents = $0.3 respectively.

Wei purchased 100 blue balloons and have $150 to buy both balloons.

So, we get the relation,

i.e.

i.e.

i.e.

Thus, Wei can purchase 300 balloons.

So, the model used for the problem is .