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Answer:
1. 15:60
(1 hour is equivalent to 60 minutes, that's why...)
15÷15 = 1
60÷ 15= 4
2. 8:12
(1 year is equivalent to 12 months)
8÷4 = 2
12÷4 = 3
3. 50:100
(1 meter is equivalent to 100 cm)
50÷50 = 1
100÷ 50 = 2
4. 500:100
(5m is equivalent to 500 cm)
500÷ 100= 5
100÷ 100 = 1
OR, to be easy...
5:1
( 100cm is equivalent to 1 m)
Answer: 5:1
5. 3:2
( 20 years is equivalent to 2 decades)