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A salt solution was made by mixing 4 pounds of salt with 10 gallons of water. At this rate, how many pounds of salt are required for 15 gallons of water?

Sagot :

ratio and proportion 
the rate is 4 pounds of salt is to 10 gallons of water. and x pounds of salt is to 15 gallons of water. 
 4 : 10 = x : 15  
10x = 60 
x=6 pounds of salt.