When dividing 4m by m, you are essentially dividing 4 by 1 (since m divided by m equals 1). Therefore, the result of 4m divided by m is 4.
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M = 5 * * * * * 4m + m - 11 = 9 or 5m - 11 = 9 so that 5m = 20 and then m = 4, NOT 5.
The Pert equation: (O+4M+P)/6, is basically a weighted average used to estimate a value. O= Optimistic (best) value M= Most likely value; multiplied by 4 because it is more likely. P = pessimistic (worst) value An average is the sum of a group of numbers divided by the count in the group. If we look at the Per Equation as: (O+4M+P)/6 = (O+M+M+M+M+P)/6, you can see the six items that are being averaged.
4m+9+5m-12=42 9m=45 m=5