The number logs of wood require is 1172 logs.
What is Unitary method?
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
Given:
1 wood= 4 planks
6 planks= 2 trapdoors
1 planks= 1/3 trapdoors
For 1562 trapdoors, planks require
= 1562*3
= 4686 planks
Now, number of log of woods require
= 4686-4
= 1171.5
= 1172 logs
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