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Hi Elizabeth;
x=quantity of watermelons in one crate.
(96 watermelons)/(12 crates)=(x)/(1 crate)
The unit of crates is in the denominators of both sides of the equation.  It cancels...
(96 watermelons)/(12 crates)=(x)/(1 crate)
(96 watermelons)/12=x/1
The only unit remaining is watermelons.  This is what we want.
Let's cross-multiply...
(1)(96 watermelons)=(12)(x)
96 watermelons=12x
Let's divide both sides by 12...
(96 watermelons)/12=(12x)/12
8 watermelons=x