From the same scores M1=40, M2=70, M3=30, M4=90, M5=20, the ratio of the highest to the lowest score is:

From the same scores M1=40, M2=70, M3=30, M4=90, M5=20, the ratio of the highest to the lowest score is:
  1. $3:1$
  2. $9:2$
  3. $2:9$
  4. $5:1$

Solution

Highest $=90$, lowest $=20$. Ratio $=90:20 = 9:2$.

Asked in: IMO

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