13 hours
78.00 ÷ 6.00 equals 13 hours
6×13 equals 78
6^2 is the correct answer
Answer:
Cody has solved (12 × 12) = 144 problems.
Step-by-step explanation:
For every one problem that Julia completes, Cody completes twelve.
If Julia Completes x problems and Cody completes y problems, then we can write y = 12x ........ (1)
Now, given that the number of problems solved by Cody is one hundred twenty more than two times the number of problems solved by Julia.
Hence, 2x + 120 = y ......... (2)
Now, from equations (1) and (2) we get,
2x + 120 = 12x
⇒ 10x = 120
⇒ x = 12
Therefore, Cody has solved (12 × 12) = 144 problems. (Answer)
The principal amount is 
<u>SOLUTION:
</u>
Given that, simple interest 
; 
after 3 years
We have to find the principal.
Now, let the principal amount be p.
Then, 
Now, we know that, Balance = Principal amount + Simple Interest
