Answer:
3/5
Step-by-step explanation:
6 green 4 yellow and 5 blue tiles = 15 tiles
4 yellow and 5 blue tiles = 9 not green tiles
P( not green) = number of not green tiles / total tiles = 9/15 = 3/5
6x - 12 + x = 9
6x + x - 12 = 9
Collect like terms
7x - 12 = 9
Add both sides 12
7x - 12 + 12 = 9 + 12
7x = 21
Divide both sides by 7
7x ÷ 7 = 21 ÷ 7
x = 3
d
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