Find the ratio a: b- 1) 2a=9b 2) a+b=3b explain your work

1) 2a = 9b    ⇒ 2:9

2) a + b = 3b   ⇒   a = 2b   ⇒   1:2

Answers: 2:9  and  1:2

2/5

Step-by-step explanation:

There are five numbers on the spinner, to find the possibility of not spinning a five, put the probability as the fraction 4/5 and since there are two sides to a coin and you don't want to roll a heads, it will be represented as 1/2 multiple the two fractions for your answer.

(4/5) times (1/2) equals 4/10=2/5