Okay, boys and girls, this is how it works:
Let’s say we have some pheros A (2.5 mcg/spray), B (2.5) and C (5 mcg/spray). We use 1 spray of phero A and 2 of B and 2 of C. Our actual amounts sprayed are 2.5, 5, and 10 mcg (easy, huh?). We want to make a mix from higher concentrations so we don’t need to spray 5 sprays all the time.
Hang in there’ it’s good, I promise…
If we get a regular bottle (30 ml) of pheromones A and B, and the concentration is 12.5 mcg per spray, then at 200 sprays per bottle that gives us 2500 mcg of pheromones in each bottle. That means each ml of liquid contains (2500/30) or 83.33 mcg.
A bottle of pheromone C with 25 mcg/spray has 5000 total, and that’s 166.67 mcg per ml.
Stick with me, it gets better. 
We want to make up a full bottle (30 ml) in these ratios. Our total of the parts is 5 (add them together) and 30/5 is 6, so we use:
(30/5) = 6 ml of A
(30/5) x 2 = 12 ml of B
(30/5) x 2 = 12 ml of C
which is the same ratio as above, 1, 2, 2.
Now, we have in our bottle:
6 x 83.33 mcg of A = 499.98 mcg of A (call it 500)
12 x 83.33 mcg of B = 999.96 mcg of B (call it 1000)
12 x 166.66 mcg of C = 2000.04 mcg of C (call it 2000)
Here’s the climax (ooh!)
Each spray of the new mix delivers:
500/200 = 2.5 mcg of A
1000/200 = 5 mcg of B
2000/200 = 10 mcg of C
Voila!
If only ONE is scented, then you would get a diminished scent depending on which component it was. If all three were scented the same, the one spray would have the same intensity of scent as one spray of any of the components.
Of course, if you were using the lower original concentrations, then you would need 5 sprays (and get 5 times the scent of one spray). And remember a to-go delivers only 83.3 percent of the regular bottle!