A rainstorm increased the amount of water stored in State J reservoirs from 160 billion gallons to 200 billion gallons. If the storm increased the amount of water in the reservoirs to 50 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm? Answers.
A) 240
B) 250
C) 260
D) 270
E) 300
Let total capacity be x   we know 200 = 0.50x   x = 200/0.50= 
<gadget id="calculator">200/0.50</gadget>
<output>400</output>
400   Prior to storm, we had 160 bn gallons     400-160= 
<gadget id="calculator">  400-160</gadget>
<output>240</output>
240   240nswer : 240
<result>A</result>
A rainstorm increased the amount of water stored in State J reservoirs from 160 billion gallons to 200 billion gallons. If the storm increased the amount of water in the reservoirs to 50 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm?