Challenge Problem of the Month

Answer correctly to win!

I will choose one person out of all the people who answer correctly to win a free Manhattan GRE Strategy Guide. If you're keen on calculations or on winning free things, you should try your hand this month.

See last month's answer

This Month's Problem: "Lowest 15 Scores"

The average of 30 test scores is 74 and the average of the 15 lowest of these scores is 15% less than the average of the 15 highest of these scores. What is the average of the 15 lowest test scores?






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