Avery water bottle holds 28 mm Sean's container holes 3/4 as much water how many millimeters of water do both contain hold

To solve this, you must solve this equation, representative to the problem. x is the answer, so in this case, the number of ml that both water bottles can hold together.

x=28 + ((28*3) : 4)

x=28+21

x = 49 [ml]