Question 698525
 How many liters of water must be added to 20 L of an 85% solution of ammonia to make a solution that is 70% ammonia?
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let x=amt of water to add
85%*20+0%x=70%(20+x)
17=14+0.7x
0.7x=3
x≈4.29
amt of water to add≈4.29 L