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Speed into the master! High score problem, we come to help take a look at ah!

xf35955412010-04-14 15:11:45 +0000 #1
A student to participate in military training, for shooting training, to be shot 10 times. In 6, 7, 8, 9 shooting, were part got 9.0, 8.4 part, 8.1 part, 9.3 part. His former 9 times the average fire rings 5 times higher than the average ring number from shooting. If he is shooting to make 10 times the average ring number more than 8.8, then the No. 10 shooting in his quest for at least the number of rings? (per second shot from rings are accurate to 0.1 rings)

This question is What is the purpose of correct answers in the end? 9.8 or 9.9 ah!

I do! Where we see what is wrong?

Solution: Italian known by the title, the former five times the average fire ring ring

the number is less than 8.7 prior to 9 total ring number shot up to: 8.7 * 9-0.1 = 78.2 (Central)

Therefore, the 10th shooting at least 8.8 * 10 +0.1-78.2 = 9.9 (ring)
1316813202010-04-14 15:17:02 +0000 #2
2ND IMC International Mathematics Invitation Contests (Singapore), 2006

middle school second-year papers

you are right

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