Linear system/Snowdrops and mistletoes/Exercise

Kevin pays ${}2.50$€ for a winter bunch of flowers with ${}3$ snowdrops and ${}4$ mistletoes, and Jennifer pays ${}2.30$€ for a bunch with ${}5$ snowdrops and ${}2$ mistletoes. How much does a bunch with one snowdrop and ${}11$ mistletoes cost?

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