Bed time

Tiffany was 5 years old; her week night bedtime grew by ¼ hour each year. If, at age 18, her curfew time is 11pm, what was her bed time when she was 5 years old?

Result

t = 7:45 hh:mm

Solution:

t+(18-5)•1/4 = 11.00

4t = 31

t = 31/4 = 7.75

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