Answer:
20
Step-by-step explanation:
To solve this you have to make a system of equations.
Since the father and son's age sum up to 60, the first equation will be:
f + s = 60
Secondly, since the father's age is 5 times the age of the son 6 years ago the equation will be:
6 - (5s) = f
Now, you have to solve the first equation to let it equal to s
f + s = 60
f = 60 - s
Plug in
6 - 5s = 60 - s
+s +s
6 - 4s = 60
-6 -6
---------------------
-4s = 54
----- -----
-4 -4
s ≅ 14
14 + 6 = 20
The given expression is
.
We need to simplify the given expression.
<h3>What is a rational number?</h3>
In mathematics, a rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.
Now group the rational numbers ![(\frac{-4}{5}\times \frac{15}{16} ) \times (\frac{3}{7}\times (\frac{-14}{9}))](https://tex.z-dn.net/?f=%28%5Cfrac%7B-4%7D%7B5%7D%5Ctimes%20%5Cfrac%7B15%7D%7B16%7D%20%29%20%5Ctimes%20%28%5Cfrac%7B3%7D%7B7%7D%5Ctimes%20%28%5Cfrac%7B-14%7D%7B9%7D%29%29)
![=(\frac{-4}{16}\times \frac{15}{5} ) \times (\frac{3}{9}\times (\frac{-14}{7}))](https://tex.z-dn.net/?f=%3D%28%5Cfrac%7B-4%7D%7B16%7D%5Ctimes%20%5Cfrac%7B15%7D%7B5%7D%20%29%20%5Ctimes%20%28%5Cfrac%7B3%7D%7B9%7D%5Ctimes%20%28%5Cfrac%7B-14%7D%7B7%7D%29%29)
![=(\frac{-1}{4}\times \frac{3}{1} ) \times (\frac{1}{3}\times (\frac{-2}{1}))](https://tex.z-dn.net/?f=%3D%28%5Cfrac%7B-1%7D%7B4%7D%5Ctimes%20%5Cfrac%7B3%7D%7B1%7D%20%29%20%5Ctimes%20%28%5Cfrac%7B1%7D%7B3%7D%5Ctimes%20%28%5Cfrac%7B-2%7D%7B1%7D%29%29)
![=(\frac{-3}{4} ) \times (\frac{-2}{3})=\frac{1}{2}](https://tex.z-dn.net/?f=%3D%28%5Cfrac%7B-3%7D%7B4%7D%20%29%20%5Ctimes%20%28%5Cfrac%7B-2%7D%7B3%7D%29%3D%5Cfrac%7B1%7D%7B2%7D)
Therefore, the simplified value of the given expression is
.
To learn more about the rational numbers visit:
brainly.com/question/17450097.
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Answer:
I really don't know lol
Step-by-step explanation:
Can you mark me brainliest please :p
You would keep the 2 hour for the whole number of the mixed number and then, make the minutes (15) as a fraction with 60, and divide them both by 20. that is just for the mixed number.