exam Maths Puzzle Numerical Ability

6 - 5[8-(2y-4)]
can you help me? I am not sure if the brackets are multiplied or not.
I came up with -54-10y and 8-(2y-4)

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exam Other Question

The width of a rectangle is 9cm. shorter than its diagonal and 7cm. shorter than its length.How long is the diagonal? Is the answer a 100 ft because that is the answer i got