This isn't the same problem but it's an idea. of what you're doing.
Answer:
30
Step-by-step explanation:
Sum of ages= 40
Let the sons age be x
Fathers age = 3 times x or ,3x
So 3x+x=40
4x= 40
x= 40/4
= 10
Therefore the fathers age = 3x
= 3*10
= 30
Answer: $3,484 <em>(I hope this is the correct way to do it)</em>
Step-by-step explanation:
The formula is: 
- SI = simple interest
- P = principal amount = $13,400
- R = interest rate (in percentage) =
% = 6.5% - T = time duration (in years) = 4 years

<em>If you want to find the total amount, add the principle amount and the interest.</em>
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The answer is 8.25 units
I took the test :)
Step-by-step explanation:
2nd one shows 10% dude...