Question

A spinner is divided into many sections of equal size. Some sections are red, some are blue, and the remaining are green. The probability of the arrow landing on a section colored red is 11 over 20. The probability of the arrow landing on a section colored blue is 6 over 20. What is the probability of the arrow landing on a green-colored section?
6 over 20 3 over 20 9 over 20 17 over 20

@thesmartone

Answer 1

@perl

Answer 2

@dan815

Answer 3

@TheSmartOne

Answer 4

@phi

Answer 5

@jim_thompson5910

Answer 6

P(red) = 11/20
P(blue) = 6/20
P(green) = x

Answer 7

P(red) + P(blue) + P(green) = 1

11/20 + 6/20 + x = 1

solve for x

Answer 8

jim im confused ?

Answer 9

@jim_thompson5910

Answer 10

what is 11/20 + 6/20 equal to

Answer 11

17/20 @jim_thompson5910

Answer 12

so we have 17/20 + x = 1

Answer 13

subtract 17/20 from both sides

Answer 14

x = 1 - (17/20)

x = 20/20 - 17/20 ... think of 1 as 20/20

x = ???

Answer 15

so 1/1

Answer 16

@jim_thompson5910

Answer 17

3/20 @jim_thompson5910

Answer 18

yep, so that's P(green)

Answer 19

ok one last question