To get rid of the 2/5 next to the g, multiply both sides by the RECIPROCAL of 2/5, which would be 5/2.
The answer is g=15/10, which simplifies to g=1 5/10 and then further simplifies (wow so much simplifying) to get g=1 1/2.
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
What a delightful little problem ! (Partly because I could see 
right away how to do it, and had the answer in a few minutes, 
after a lot of impressive-looking algebra on my scratch-paper.)
Three consecutive integers are . . . x,  x+1,  and  x+2
The smallest two are . . . x  and  x+1
    Their product is . . . . . x(x+1)
5 times the largest one is . . . 5(x+2)
      5 less than that is . . . . . . 5(x+2)-5
Now, the conditions of the problem say that    <u>x (x + 1) = 5 (x+2) - 5</u>
THAT's the equation we have to solve, to find 'x' .
       Eliminate parentheses:    x² + x = 5x + 10 - 5
            Combine like terms:    x² + x = 5x + 5
Subtract 5x from each side:    x² - 4x = 5
Subtract  5  from each side:   <u>x² - 4x - 5 = 0</u>
You could solve that by factoring it, or use the quadratic equation.
Factored, it says that    (x + 1) (x - 5) = 0
From which       <em>x = -1</em>
             and      <em>x = +5</em>
We only want the positive results, so our three consecutive integers are
             5,  6,  and  7 .    
To answer the question, the smallest one is    <em><u>5 </u></em>.
<u>Check</u>:
   5 x 6  ? = ?  (7 x 5) - 5
       30  ? = ?  (35) - 5
         30   =   30
             yay !    
        
             
        
        
        
It doubles every 4 hours, so after 24 hours there will be 6 doublings.
2^6 = 64
So, the population will be (3,000,000 * 64) or 192,000,000 in 24 hours.
The answer is B.