Question
The length of Threads J and K is 30.87 m. The length of Threads K, L and M is 56.63 m. The total length of Threads L, M and N is 78.86 m. Thread N is four times the length of Thread J. Find the length of Thread N. Express the answer in metres.
4 m

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The length of Threads J and K is 30.87 m. The length of Threads K, L and M is 56.63 m. The total length of Threads L, M and N is 78.86 m. Thread N is four times the length of Thread J. Find the length of Thread N. Express the answer in metres.