Answer :

harpazo
Let x = what amount

Rewrite 12 1/2 as 25/2.

(25/2)(x) = 10.40

Take it from here. Solve the equation for x.
stevekimaz
of = multiply
what = x
is means =

(12.5)x = 10.4
x = 10.4/12.5 = 104/125

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