Because it is like having a unit of measurement that is set
lets say that in a certain country, one serving of bread is 1/2 of the standard loaf
and if you have 3 servings, you have 3/2 loaf so the bottom number tells you how many parts out of 1 whole you have
In order to find out how much they both each pay, you would have to put two places in front of the percentage of the payment.
You can do a notebook a door , a frame or a mirror, mostly anything that has angles
<span>a^2 * b^3 = 108 this is true for a = 2 and b = 3. So 2a + 3b = 2(2) + 3(3) = 4 + 9 = 13</span>