Modern Maths of Life

Equation 1
Human = eat + sleep + work + enjoy
Donkey = eat + sleep

Therefore,
Human = Donkey + work + enjoy

Therefore,
Human - enjoy = Donkey + work

In other words,

Human that don't enjoy = Donkey that work
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Equation 2
Men = eat + sleep + earn money
Donkeys = eat + sleep

Therefore,
Men = Donkeys + earn money

Therefore,
Men - earn money = Donkeys
In other words,

Men that don't earn money = Donkeys
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Equation 3
Women = eat + sleep + spend
Donkeys = eat + sleep

Therefore,
Women = Donkeys + spend

Therefore,
Women - spend = Donkeys

In other words,

Women that don't spend = Donkeys

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To Conclude:
From Equation 2 and Equation 3
Men that don't earn money = Women that don't spend.
So, Men earn money not to let women become Donkeys!(Postulate 1)
And, Women spend not to let men become Donkeys!(Postulate 2)

So, we have...
Men + Women = Donkeys + earn money + Donkeys + spend money

Therefore...from Postulates 1 and 2, we can conclude

Man + Woman = 2 Donkeys that live happily together!