5:7 (pencils to pens)
7/12 chance that a pen from the first box will be selected.
4:4 (colour pencils to crayons)
4/8 = 1/2 chance that a crayon from the second box will be selected.
The probability of picking both:
7/12 * 1/2 = 8/24 = 1/3
        
             
        
        
        
14 students play a brass instrument :)
        
                    
             
        
        
        
Answer:
2a + 4c = 95
3a +7c =155
Step-by-step explanation:
2a + 4c = 95
3a +7c =155
 
        
             
        
        
        
Answer:
 3).

 4).
 
 
If it was by 10, k = 3 by 10
k = 30
5).
