Answer:
a) How many people who attended a certain party arrived by 8 PM 60 people
Step-by-step explanation:
2/3 of all people who attended a certain party arrived by 8 P.M . That means that 1/3 arrived in other time. But 2/3 + 1/3 is total number of people in the party.
1) 9 people arrived after 9 PM
And in 2
2) .... By 9 .00 PM 90 % of people were already in the party and. That means
that 9 people who arrived after are 10 %
Then if 9 people are 10 %
x people are 100%
x = (100*9)/10 ⇒ x = 900/10
x = 90
Here we got total number of people in the party 90
Then 2/3 of 90 is 180/3 60
1/3 0f 90 is 30
