Answer:
= 
Step-by-step explanation:
<u><em>Explanation:-</em></u>
Given that

= 
= 
= 
= 
When you say either, you add both A and B
0.3+0.4=0.7
Your answer is 0.70 which means 70%
Answer:
39
Step-by-step explanation:
33.3 because 27/50=36/x and x=66.67 and thats how much as decayed after 36 hours but you want what is left so subtract from 100 and get 33.3
Answer:
1. 4
2. 11
3. 18
4. 25
Step-by-step explanation: