Let the three apartments be A, B & C
The rent of A is $x
The rent of B is $y
The rent of C is $z
So x + y + z = 1600 .......(1)
Now
Maintenance of A is 20% of x = 0.20x
Maintenance of B is 20% of y = 0.20y
Maintenance of C is 25% of z = 0.25z
0.20x + 0.20y + 0.25z = 345
Multiplying by 100 we get
20x + 20y + 25 z = 34500
Dividing by 5 we get
4x + 4y + 5z = 6900 .......(2)
Monthly fee of A is 10% of x = 0.10x
Monthly fee of B is 20% of y = 0.20 y
Monthly Fee of C is 10% of z = 0.10z
Now
0.10x + 0.20y + 0.10 z= 1820 - 1600
0.10x + 0.20y + 0.10z = 220
Multiplying by 100 we get
10x + 20y + 10z = 22000
Dividing by 10
x + 2y + z = 2200 ....(3)
Making a Matrix of equation (1), (2) & (3)
is the required matrix
Multiply 10 by 7 and you will get 70 so the answer would be 70 days
6% because...
7 x 6% = 7.42 (because 7 x 6 = 42)
Hope that this helps! c:
1 pound = 16 ounces
16+9 = 25 ounces
2 /25 = 0.08 per ounce
it costs 8 cents per ounce
set bottom equation to look like first one.
2x+4y=4
this equation is the same equation as the first just multiplied by 2. the answer is c. infinite solutions. you can plug in and solve:
solve bottom equation equal to y, you get y=-1/2x+1
plug into top equation
x+2(-1/2x+1)=2
x-x+2=2
2=2
because that is a true statement it is c. infinite solutions