In a garden, there are 10 rows and 12 columns of mango trees. The distance between the two trees is 2 metres and a distance of one metre is left from all sides of the boundary of the garden. The length of the garden is
(a)20 m
(b)22 m
(c)24 m
(d)26 m
Answer
Answer (as printed): C
Explanation
Each row contains 12 plants. 12 plants have 11 gaps between them. So, total length of gaps $=(11 \times 2)$ metres and 1 metre is left on each side. $\therefore \quad$ Length $=(22+2) \mathrm{m}=24 \mathrm{m}$.