After the floods that hit a school, parents help repair the damage. My father worked at the school 50 hours, my mom 5 hours less. How many hours worked mother? How many hours worked my parents together?

Correct result:

m =  45 h
x =  95 h


m=505=45 hm = 50-5 = 45 \ \text{h}
x=50+m=50+45=95 hx = 50+ m = 50 + 45 = 95 \ \text{h}

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