30 square yards.
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234 square feet (18 x 13 = 234)/
1 acre = 43,560 square feet 13 acres = 566,280 square feet
The answer will depend on 24 WHAT!
The answer depends on the units used fopr 23 and 13. It should be obvious to anybody tha the square footage of 23 feet by 13 feet will be quite different to that for 23 metres by 13 metres (or any other units of length)!
13'x13' = 169 square feet