I think that the answer is 25
        
             
        
        
        
Answer:
YFHKIMEDAIOUKIMENAUODIOOSHIETIAOKURETAAAAA
Step-by-step explanation:
 
        
             
        
        
        
First 1/5 is equivalent to 20% so to get 20% of both of them multiply by .2. so 400×.2=80 and 90×.2=18
        
             
        
        
        
Answer:
Step-by-step explanation:
The tree when he got it was half the size it is now.  If the tree is 9 feet tall, back then it was half of 9 feet, which is 4.5 feet.
 
        
                    
             
        
        
        
This equation has no solution where 'a' and 'b' 
are both non-zero real numbers.
You said                                 2a + 2b = 2a
Subtract 2a from each side:         2b = 0
'b' must be zero.
And it doesn't matter what the value of 'a' is.
As long as b=0, 'a' can be any number.