Step-by-step explanation:
Answer:
The correct answer is "50%".
Step-by-step explanation:
The given values are:
Gravel,
= 
Water,
= 
Cement,
= 1
Sand,
= 2
Now,
The total mixture will be:
= 
By substituting the values, we get
= 
= 
= 
hence,
The percentage of sand will be:
= 
= 
=
%
Answer:
The letter "x" is often used in algebra to mean a value that is not yet known.
Step-by-step explanation:
Answer: 2 years 1 month
Step-by-step explanation:
2 years 1 month at $100 a month = $2,500
$720 x 2 years = $1,440
$720 / 12 months = $60
$1,440 + $60 = $1,500
$4,000 - $1,500 = $2,500