exam Maths Puzzle Numerical Ability

A car travels 100 mph for the first half of a 400 mile race. How fast must the car go to average 200 mph?

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exam Other Question

Why are variables useful in algebra? Columbian Earthquake of 1906 At 8.6 on the richter scale, the Colombian earthquake of January 31, 1906, was one of the strongest earthquakes on record. Use the formula log(I)-log(Io) to write I as a mulitple of Io for this earthquake.