It should be , Equation Q: 8y+7z=1
3x(3x-2y)
you have to find a common factor between the two numbers. in this case it's three, so you just divide each number by three.
112 is 80% of 140.
80% can be written as 0.80 or 0.8.
how i got 140 is by finding the x value of this equation: 0.8x=112
to find the x, i divided 0.8 from both sides,
0.8 divided by 0.8 cancel out.
112 divided by 0.8 is 140.
therefore, 112 is 80% of 140