Answer:
1. 4/5 = N/15
5N = 4 × 15
5N = 60
5N/5 = 60/5
2. 7/N = 42/36
42N = 7 × 36
42N = 252
42N/42 = 252/42
3. 3/N = 12/36
12N = 3 × 36
12N = 108
12N/12 = 108/12
4. N/7 = 21/49
49N = 7 × 21
49N = 147
49N/49 = 147/49
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Answer:
1. 4/5 = N/15
5N = 4 × 15
5N = 60
5N/5 = 60/5
N = 12
2. 7/N = 42/36
42N = 7 × 36
42N = 252
42N/42 = 252/42
N = 6
3. 3/N = 12/36
12N = 3 × 36
12N = 108
12N/12 = 108/12
N = 9
4. N/7 = 21/49
49N = 7 × 21
49N = 147
49N/49 = 147/49
N = 3