He needs to buy 7 boxes of carpet squares.
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
Total number of carpets Mr. Cullen need =91 carpet squares
Total number of carpets Mr. Cullen have= 49 carpet squares.
number of carpets Mr. Cullen need to complete
=91 - 49
= 42 carpets squares
So, Mr. Cullen needs 42 carpets squares.
If each carpet is sold in making boxes of 6. He needs
=42/6
=7 boxes
Hence, He needs to buy 7 boxes of carpet squares.
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