XOIQ:

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The questions states that the bulbs are placed on the two breadths and one length of the rectangle, not the entire rectangle as illustrated

TheJFamily:

cream and chocolate:

The 525 question is 3m but depends on whether you get method mark...

I think the answer is 585

Yes, the answer is 585. The bulbs are placed on the one length and two breadths of the rectangle, five in each breadth. But, note that the bulbs at the corner of the rectangle is also part of the length. So actually there's 5 bulbs on each breadth, but there are 10 bulbs on the length. Since there are nine 'gaps' between the 10 bulbs the answer is 9x65=585 and not 525 or 325 as others have mentioned.

P.S.: my drawing is crude so please don't complain about how terrible it is
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