Divide then multiply by 100:
280 / 3500 = 0.08
0.08 x 100 = 8%
Answer: 8%
ANSWER
The solution to the system is
EXPLANATION
The system of equations are:
and
We put equation (2) in to equation (1) to get,
We expand the parenthesis to obtain,
We group like terms to obtain,
This implies that,
We divide through by 5 to get
We substitute the value of y in to equation (1) to get,
This implies that
We divide both side by 3 to get,
It's a COMBINATION where 7 are chosen out of 11
₁₁C₇ = (11!)/(7! , 4!) = 330 combinations
The answer is 10. 10 * 10= 100 and 10+10= 20