book Maths Puzzle Numerical Ability

Find the three arithmetic means between 18 and -10

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book Other Question

Walt and Gail left a stable for a ride to a mountain lookout. On the way up, they averaged 3 mi/h. On the way back along the same trail, they averaged 5 1/4 mi/h, and the return tr y=x-9 (7,10) find the point for a slope