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algebra 2--matrices.

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A grocer wants to m,ix three kinds of hard candy to sell for $2.40 per pound. He need 50 pounds of candy altogether. He mixes sour balls worth $3.50 per pound,butterballs worth $2.50 per pound, and starlight mints worth $1.75 per pound. He mixes twice as many butterball as sour balls. Write a system of equations to find the number of pounds of each kind of candy he mixes together

We learned how to do matrices and we need to use them for this problem but i don't know how to set it up
_______ X _______
something X something?

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