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Mathematics 9 Online
Maria101:

Mr. Williams is building a sandbox for his children.It costs $228 for the sand if he builds a rectangular-sandbox with dimensions 9 ft by 6ft .How much will the sand cost if he decides to increase the size to 13 1/2 ft by 9ft?

Ferredoxin4:

Form a proportion and isolate the unknown value by cross multiplying $228/(9×6) = $x/(13.5×9)

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