Takdir wrote:
why the answer is E?
You can look at the argument in math terms.
1950: 9 injuries on the slopes per 1000 skiers --> Off slopes injuries are 10% of injuries. So, 9 on slopes injuries per 1000 must be 90% of injuries.
Total injuries per 1000 1950: 9 on slopes + 1 off slopes = 10 total
1980: 3 injuries on the slopes per 1000 skiers --> Off slopes injuries are 25% of injuries. So, 3 on slopes injuries per 1000 must be 75% of injuries.
Total injures per 1000 1980: 3 on slopes + 1 off slopes
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