The domestic postage rate for first-class letters weighing 12 oz or less is $0.37 for the first ounce and $0.23 for each additio
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Step-by-step explanation:
We need to find the value of x for all problems if Y is between X and Z.
For all cases, XZ = XY+YZ
4. XY = 5x, YZ=x, and XZ=25
Putting all values
25 = 5x + x
25 = 6x
5. XY = 12, YZ=2x, and XZ = 28
28 = 12 + 2x
x = 8
6. XY = 4x. YZ=3x, and XZ = 42
XZ = XY+YZ
42 = 4x + 3x
42 = 7x
x = 6
7. XY=2x + 1. YZ = 6x, and XZ=81
XZ = XY+YZ
81 = 2x + 1 + 6x
80 = 8x
x = 10