Fractions and Ratios, Mixture Problems

In what proportion must rice at $\$3.10$ per $\text{kg}$ be mixed with rice at $\$3.60$ per $\text{kg}$ so that the mixture be worth $\$3.25$ per $\text{kg}?$

A. $3{:}7$
B. $3{:}5$
C. $5{:}3$
D. $7{:}3$
E. $8{:}3$

The OA is D

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