The dimension for the first room is

By conversion,

The area of the first room will be

The second room has a dimension of

The area of the second room will be

The dimension of the third room is

The area of the third room will be

The total area of the three rooms will be

Recall that

The final answer to be converted to the squared yard would be divide by 9

Hence,
The number of square yards of carpet to be ordered = 78.2 sq yd