At a country concert, the ratio of number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many
1 answer:
You might be interested in
Answer:
Step-by-step explanation:
The first thing you must remember is the mulplication of signs. You know that:
You can observe that the number inside the parentheses is positive (+) and the sign that is outside the parentheses is negative (-), therefore, when you multiply these signs you get a negative sign (-). Then you get:
Now, you need to add these numbers. And the result obtained is:
Answer:
Option 2 -
Step-by-step explanation:
Given : John rolls a six-sided number cube twice.
To find : What is the probability of getting an even number and then an odd number?
Solution :
When rolls a six-sided number cube twice
(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)
(2,1) (2,2) (2,3) (2,4) (2,5) (2,6)
(3,1) (3,2) (3,3) (3,4) (3,5) (3,6)
(4,1) (4,2) (4,3) (4,4) (4,5) (4,6)
(5,1) (5,2) (5,3) (5,4) (5,5) (5,6)
(6,1) (6,2) (6,3) (6,4) (6,5) (6,6)
Now,
Favorable outcome of getting an even number and then an odd number:
(2,1) (2,3) (2,5) (4,1) (4,3) (4,5) (6,1) (6,3) (6,5)
So, Favorable outcome = 9
Total number of outcome = 36
Therefore, Option 2 is correct.