Ratio of 7:2 so there are 9 parts altogether (7 + 2)
We know 9 parts = 828 cm from the question
So each ONE part is 828/9 = 92 cm
We want 7 parts and 2 parts
7 * 92 = 644 cm
2 * 92 = 184 cm
Quick check is to add them together, 644 + 184 = 828 cm which is what the whole thing was so check is ok.
If I had bothered to read the question (doh!) I would have realised we just want the bigger part.
Edited by diggingdeeper (5th Jul 2010 8:59pm)
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