Question

Boy and Girl sells mixtures of almonds and raisins. A kilogram of almonds and raisins cost $300 and $125, respectively. If the final cost of the mixture is $1,400 and the mixture contains 7.5kg of the raisins, how many kilograms of almonds were mixed?
well, just add up the costs:

125(7.5) + 300x = 1400(7.5+x)

These must be special gold nuts, at those prices!!!

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