The odds of choosing one black ball from an urn are 7 to 13. what is the probability of getting a black ball?

Step-by-step explanation:

The odds for an event is basically the ratio of the favorable outcomes to the unfavorable outcomes.

Given : The odds of choosing one black ball from an urn are 7 to 13.

i.e. favorable outcomes for getting black ball = 7

i.e.  unfavorable outcomes for getting black ball = 13

Now , Total outcomes = favorable outcomes+  unfavorable outcomes

=7+13=20

Then, the probability of getting a black ball

Hence, the required probability

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9