1. solution

2. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?

3. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?

4. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ? 30

5. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
20% of the 30 ounces is alcohol.
20% of 30 = (.20)(30) = 6
There are 6 ounces of alcohol
and 24 ounces of water. 30

6. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ? 6 30

7. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
Let x = the number of
ounces of pure alcohol
to be added. 6 30

8. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ? x 6 30

9. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
# ounces of alcohol
# ounces of solution x
= .40 6 30

10. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
# ounces of alcohol=x+6
# ounces of solution x
= .40 6 30

11. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
# ounces of alcohol=x+6
# ounces of solution=30+x x
= .40 6 30

12. How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
# ounces of alcohol=x+6
# ounces of solution=30+x x
= .40 6 30

13. x+6 30+x How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
x+6
30+x x
= .40 6 30

14. x+6 30+x How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ?
x+6
30+x x
= .40 6
x+6 = ( 30+x )
x+6 = x
.6x =
x = 30

15. 10 x+6 30+x How many ounces of pure alcohol must be added to
30 ounces of a 20% alcohol solution
to make a 40% alcohol solution ? 10 ounces
x+6
30+x x 10
= .40 6
x+6 = ( 30+x )
x+6 = x
.6x =
x = 30