Answer: a
the answer is A because its the one that has repeated the most
 
        
                    
             
        
        
        
There will be 23 layers of brick, because 7500/321 = 23 with 117 leftover.
        
             
        
        
        
Hey there! 
12/14
• BOTH NUMBERS HAVE THE COMMON FACTOR OF 2, SO WE CAN DIVIDE BOTH THE NUMERATOR (TOP number) FROM THE DENOMINATOR (BOTTOM number) 
= 12 ÷ 2 / 14 ÷ 2
= 6/7
= 18/21
Therefore, your answer is: 6/7 or 18/21
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)