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Gas stations only have 2 tanks! They have regular and they have premium. The mid grade is made by setting a ratio and pumping from both.
So, yes, you can do exactly what they do. But remember the ratio's may be off if you don't add exactly the same. But a ballpark should be close enough.
No magic numbers, Simple average. 5 gallons (87) + 5 gallons (91) = 10 gallons 89 (gas station mid grade)
So, 5 gallons (89) + 5 gallons (93) =10 gallons (93+89/2) = 10 gallons (91)
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