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11. How many liters of 15% salt solution should be added to 70 liters of 30% salt
solution to obtain a mixture that is 25% salt solution?
a. 15 liters
b. 20 liters
c. 29 liters
d. 35 liters

12. Red is 2 less than 3 times Iver's age. Three years from now, Red will be 7 more
than twice Iver's age. How old will Red be 3 years from now?
a. 37
b. 24
c. 18
d. 12