Solution
Using the formula, $$(x-y)^3 = x^3 - y^3 -3xy(x-y)$$
=> $$(m - 5n)^3 = m^3 - 125n^3 - 15mn(m-5n)$$
=> $$2^3 = m^3 - 125n^3 - 15mn*2$$
=> $$m^3 - 125n^3 - 30mn = 8$$
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