math
posted by Anonymous .
One night Angel spent 2 hours and 41 minutes doing homework. She spent 43 minutes on math, 37 minutes on language arts, and half an hour on science. The rest of her time was spent on social studies. How much time did she spend on social studies?

she spend 60*2+41 minutes on homework: 161minutes
she spend on 43 min on math, 37 on language, and 60 min on science: total 140 min
so how much is left? 
51
work:
60*2=120+41=161
43+37+30=110
161110=51 
45+35=80