PSLE Maths Ribbon Question: Solved In Real Life

By now you would have heard about the Primary School Leaving Examination (PSLE) mathematics question that got 12-year-old kids and their parents scratching their heads.

But in case you haven't:

Jess needs 200 pieces of ribbons of 110 cm each to decorate a room for a party.
The ribbons are sold in 25m rolls.
What is the minimum number of rolls that Jess needs to buy?

If you think the answer's 9, think again.

We buy a lifetime's worth of ribbons and find out the answer once and for all.

For more on this problematic problem, check out this story:
http://www.tnp.sg/news/singapore/parents-irked-tricky-psle-maths-question

p.s. We still don't know why Jess needs so many ribbons. She did not invite us to her party -__-