Given that, the ratio of girls to boys in class is 9 to 7.
Let's assume there is 9x girls and 7x boys in the class.
There is total of 80 students which means sum of 9x and 7x must be equal to 80. So, we can set up an equation as following:
9x + 7x = 80
16x = 80 Combine the like terms.
Divide each sides by 16 to isolate x.
So, x = 5
Since there is 9x girls in the class. So, next step is to substitute x=5 in 9x to get the number of girls in the class. Therefore,
9x = 9(5) =45.
Hence, there is 45 girls in the class.
Answer:
A
Step-by-step explanation:
I believe your answer is 7:40
<h3><u>
Answer:</u></h3>
From the Venn diagram the value of:
P(A∩B∩C)=3/25
<h3><u>
Step-by-step explanation:</u></h3>
We are asked to find the probability of A∩B∩C.
We know that the probability of A∩B∩C is calculated as the ratio of the values of the region to the total value (i.e. whole of the given universal set)
The value of region A∩B∩C is 6.
and the value of total region is: 50
( since: 9+5+8+4+6+2+7+9=50)
Hence,
P(A∩B∩C)=6/50
On writing it in the simplest fraction we get:
P(A∩B∩C)=3/25
Answer:
Step-by-step explanation:
Among the 15 cars ,only 9 cars with a fuel efficiency less than 32 mpg :
27,22,18,23 , 30 , 19,16,28,21