Answer :
The minimum total length of fencing required is 110 metres.
To calculate this, we first need to find the total length of fencing required for each pen. This is equal to the perimeter of the pen, which is 2(5 + 20) = 50 metres.
Since there are 3 pens, the total length of fencing required for all 3 pens is 3 * 50 = 150 metres.
However, we can save some fencing by using the sides of the pens that are next to each other. This means that we only need to fence 3 sides of each pen, instead of 4.
Therefore, the minimum total length of fencing required is 3 * 35 = 105 metres.
In addition, we need to add the length of the fencing that separates the pens. This is equal to the width of each pen, which is 5 metres.
Therefore, the minimum total length of fencing required is 105 + 5 = 110 metres.
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