There are: 12+9 = 21 months
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9 months. Since there are 12 months in a year, you multiply 12 months by 3/4 to get 9.
one tenth of 9 years = 0.9 year or 10.8 months 1/10 * 9 years = 0.9 year * 12 months/1 year = 10.8 months
1 year and 9 months.
1 year = 12 months so 9 years = 9*12 = 108 months. Simple!
12 months = 1 year 21 months = 21/12 years = 1.75 years = 1year 9months