Jana rose in the morning in the quarter to seven. She slept nine and a half hours. When did she go to sleep?


t = 21:15 hh:mm Wrong answer

Step-by-step explanation:

t1=6+3/4=274=6.75 h t2=9+1/2=192=9.5 h  t3=t1t2=6.759.5=114=2.75  t=t3+24=(2.75)+24=21.25=21:15 hh:mm

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