Question 949379
Show your method used to solve problem.
If the cost of 5 roses, 9 irises and 6 carnations is the same as 3 carnations 6 irises and 8 roses find the cost of a single iris if it cost $42 for a dozen roses and a carnation is three-quarters the cost of an iris.
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let r=cost/rose=42/12
let i=cost/iris
let c=cost/carnation=(3/4)i
..
5r+9i+6c=3c+6i+8r
5(42/12)+9i+6(3/4)i=3(3/4)i+6i+8(42/12)
210/12+9i+(18/4)i=(9/4)i+6i+336/12
lcd:12
210+108i+54i=27i+72i+336
63i=126
i=2
cost of a single iris=$2