Question

Some bamboo pillars are to be planted around a rectangular lawn 25m long and 20m wide. If the pillars are planted at a distance of 5m. How many pillars are needed to plant?

Answer 1

16 pillars are required

Answer 2

Total pillars of bamboo are to be planted around a rectangular lawn=18

Step-by-step explanation:

Length of rectangular lawn=l=25 m

Width of rectangular lawn=b=20 m

Distance between two bamboo pillars=5 m

Distance between three  bamboo pillars=10 m

Distance between four  bamboo pillars=10+5=15 m

Distance between five  bamboo pillars=15+5=20 m

Distance between six bamboo pillars=20+5=25 m

In n meter, bamboo pillars are to be planted along one length of rectangular lawn=$\frac{n}{5}+1$

6 bamboo pillars are to be planted along one  length of rectangular lawn.

Number of bamboo pillars  are to be planted along  two length of rectangular lawn=$6\times 2=12$

Number of bamboo pillars  are to be planted along one breadth of rectangular lawn=$\frac{n}{5}-1=\frac{20}{5}-1=3$

Because two bamboo pillars are already planted on two corners  

Number of bamboo pillars  are to be planted along two breadth side of rectangular lawn=$3\times 2=6$

Total pillars of bamboo are to be planted around a rectangular lawn=6+12=18

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