Question

ratio of each 4 months to 1 year 6month

Answer 1

1 year 6 months = 12 +6 = 18 months

so 4:18 = 2:9 is the required ratio

Answer 2

1 year 6 month = 1 year + 6 month

1 year 6 month = 12 months + 6 months

1 year 6 month = 18 months

Required Ratio = 4 month : 1 year 6 month

=> Required Ratio = 4 : 18

=> Required Ration = 2 : 9