Morning

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

Result

t = 21:15 hh:mm Wrong answer

Solution:

t1=6+3/4=274=6.75 h t2=9+1/2=192=9.5 h  t3=t1−t2=6.75−9.5=−114=−2.75   t=t3+24=(−2.75)+24=854=21.25=21:15 hh:mmt_{1}=6 + 3/4=\dfrac{ 27 }{ 4 }=6.75 \ \text{h} \ \\ t_{2}=9 + 1/2=\dfrac{ 19 }{ 2 }=9.5 \ \text{h} \ \\ \ \\ t_{3}=t_{1} - t_{2}=6.75 - 9.5=- \dfrac{ 11 }{ 4 }=-2.75 \ \\ \ \\ \ \\ t=t_{3} + 24=(-2.75) + 24=\dfrac{ 85 }{ 4 }=21.25=21:15 \ \text{hh}:\text{mm}

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