Answer:

Step-by-step explanation:
Let's use a start by using common denominators.
and 
Now, replace the original equation with the common denominators. 
Solve! 
Answer:
$1920
Step-by-step explanation:
First, find out how much he earns in one week-so $8 times 40 = 320. Then multiply 320 by 6 to get how much earns in 6 weeks which is $1920.
(hope this helps :P)
Answer:
24.15
Step-by-step explanation:
The answer is to that is 100
25times 4