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ANSWER :

IV. Solve each proportion

1) n = 20

2) n = 1

3) n = 3

4) n = 3

5) n = 16

SOLUTION :

1) 3/4 = 15/n

3 × n = 3n

4 × 15 = 60

60 ÷ 3n = 20

2) n/3 = 8/24

n × 24 = 24n

3 × 8 = 24

24 ÷ 24n = 1

3) 2/n = 10/15

2 × 15 = 30

n × 10 = 10n

30 ÷ 10n = 3

4) 6/10 = n/5

6 × 5 = 30

10 × n = 10n

30 ÷ 10n = 3

5) n/4 = 24/6

n × 6 = 6n

4 × 24 = 96

96 ÷ 6n = 16