If it takes one person 4 hours to paint a room and another person 12 hours to
paint the same room, working together they could paint the room even quicker, it
turns out they would paint the room in 3 hours together. This can be reasoned by
the following logic, if the first person paints the room in 4 hours, she paints 14 of
the room each hour. If the second person takes 12 hours to paint the room, he
paints 1 of the room each hour. So together, each hour they paint 1 + 1 of the 12 4 12
room. Using a common denominator of 12 gives: 3 + 1 = 4 = 1. This means 12 12 12 3
each hour, working together they complete 13 of the room. If 13 is completed each hour, it follows that it will take 3 hours to complete the entire room.
This pattern is used to solve teamwork problems. If the first person does a job in A, a second person does a job in B, and together they can do a job in T (total). We can use the team work equation.
Teamwork Equation: A1 + B1 = T1
Often these problems will involve fractions. Rather than thinking of the first frac-
tion as A1 , it may be better to think of it as the reciprocal of A’s time.
World View Note: When the Egyptians, who were the first to work with frac- tions, wrote fractions, they were all unit fractions (numerator of one). They only used these type of fractions for about 2000 years! Some believe that this cumber- some style of using fractions was used for so long out of tradition, others believe the Egyptians had a way of thinking about and working with fractions that has been completely lost in history.
Answer:
3/10 or 0.3 or 30%
Step-by-step explanation:
Its 225/750 total students
We simplify this by dividing by 5
45/150
Divide by 5 again
9/30
Divide by 3
3/10
Answer:
Answer J or 900!!
Step-by-step explanation:
Brainliest Please!
Answer:
Probability (Both fail) = 0.001369
Probability (None fails) =0.927369
Probability (at least one fails) = 0.072631
Step-by-step explanation:
given data
Probability (fail) P = 0.037
two alternators is independent
solution
we get here first probability that both will fail will be
Probability (Both fail) = 0.045² ................1
Probability (Both fail) = 0.001369
and
now we get probability that neither will fail
Probability (None fails) = (1-0.037)² ...............2
Probability (None fails) =0.927369
and
now we get probability that at least one fails
Probability (at least one fails) = 1 - Probability (non fails) .................3
Probability (at least one fails) = 1 - 0.927369
Probability (at least one fails) = 0.072631
