Malcolm bought dog-food bowls to give away as prizes at a dog-lovers event. the plastic bowls cost 6 dollars each and the stainless steel bowls cost 10.50 each. malcolm bought 7 plastic bowls and spent a total of 136.50 dollars on prizes. how many stainless steel bowls did malcom buy?

Answer
9 stainless steel bowls

Solution
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What we know: 
Malcolm bought 7 plastic bowls and spent a total of 136.50 dollars on prizes
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We would subtract: 
136.50 - 42 = 94.5 
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After determining the price of the stainless steel bowls, we would then divide: 

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Were is the diagram?