Question

please answer this with explanation
not only answers
answers are
1) 10:21
2) 30:35:63
how the answers will come please tell with explanation
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Answer 1

Answer:

10:21

Step-by-step explanation:

l/m=6/7

m/n=5/9

7l=6m & 9m=5n

multiply by 3 & 2 respectively

21l=18m & 18m=10n

from here l:n =21:10

& l:m:n is 21:18:10

Answer 2

1. 5:2 (answer)

2. 15:10:6 (answer)