Working alone, Mr. Tough can grade the final exams in 12 hours. His assistant, Mrs. Nice, cam grade the same exams in 15 hours.
What fraction of the exams can Mr.Tough and Mrs.Nice grade in 1 hour if they work together?
1 answer:
Answer:
9n/60
Step-by-step explanation:
add 1/12 + 1/15 which = 5/60 + 4/60.
= 9/60
YAY!!!!!!!
You might be interested in
1/4 trust me bro just took it
Answer:
square feet
Step-by-step explanation:
Area has units of squared length.
George will receive 13% of his old income
Answer
b
Step-by-step explanation:
It will take Dave 7 weeks to earn the right amount of money.
