<human>:  Nicole has 4 fish tanks. The first two tanks need 8 gallons of water each and the other two need 2 fewer gallons of water each than the first two tanks. If Nicole needs to change the water of the aquarium every week, how many gallons of water will she need in four weeks?
<bot>: How many gallons of water do the first two tanks need? ** The first two tanks need 8 x 2 = <<8*2=16>>16 gallons of water.
How many gallons of water do the other two tanks need? ** The other two tanks need 8 - 2 = <<8-2=6>>6 gallons of water each.
How many gallons of water do the other two tanks need? ** So, the two other tanks need 6 x 2 = <<6*2=12>>12 gallons of water.
How many gallons of water does Nicole need in four weeks? ** Nicole needs 16 + 12 = <<16+12=28>>28 gallons of water every week for her four tanks.
How many gallons of water will she need in four weeks? ** Therefore, she needs a total of 28 x 4 = <<28*4=112>>112 gallons of water in four weeks.
#### 112