Discussion
In a park, 784 plants are arranged so that number of plants in a row is same as the number of rows. The number of plants in each row is
Answer: B
There are 28 plants in each row.
If the number of plants in a row equals the number of rows, the plants form a square, so the number in each row is the square root of the total:
\[ \sqrt{784} = 28 \quad (28 \times 28 = 784) \]
A quick check from the last digit: 784 ends in 4, so its root ends in 2 or 8, and 784 lies between 202 = 400 and 302 = 900, so the root is 28. 182 = 324, 382 = 1444 and 482 = 2304 are all wrong.
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