Answer:
1
Step-by-step explanation:
This is because 13 is a primary number
x = the age of his son now, then the age of the father is 4x.
In 20 years,
son's age = x + 20
father's age = 4x + 20
solve the equation for x:
4x + 20 = 2(x + 20)
4x + 20 = 2x + 40
2x = 20
x = 10
So the age of his son now is 10, and the age of the the father now is 40.
<h3>
Answer: 72</h3>
Divide the 9 inch side into 9 "1 inch" sub-segments
Divide the 4 inch side into 2 "2 inch" segments
Divide the 12 inch side into 4 "3 inch" segments
So we have 9*2*4 = 18*4 = 72 boxes that can fit.
