Wallace's water heater is twice the size of Catherine's water heater. If the capacity of Wallace's water heater is 40 gallons and it's 3/4 full, calculate the total number of gallons of water they both have if Catherine's water heater is also full with water to 3/4 of its capacity. Let's think step by step and output the final answer after "####".
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When 3/4 full of water, Wallace's water heater has 3/4*40 = <<3/4*40=30>>30 gallons of water.
Catherine's water heater capacity is 40/2 = <<40/2=20>>20 gallons
When 3/4 full, Catherine's water heater has 3/4*20 = <<3/4*20=15>>15 gallons of water.
Together, when 3/4 full with water, Wallace's and Catherine's water heaters hold 15+30 = 45 gallons of water.
#### 45
Wallace's water heater is twice the size of Catherine's water heater. If the capacity of Wallace's water heater is 40 gallons and it's 3/4 full, calculate the total number of gallons of water they both have if Catherine's water heater is also full with water to 3/4 of its capacity.
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