exam Maths Puzzle Numerical Ability

60. solve the equation algabraically log.4 x-log.4(x-1)=1/2

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exam Other Question

Two boats leave a ramp traveling in opposite directions.The second boat is
10 miles per hour faster than the first. After 3 hours they are 150 miles apart.
Find the speeds of the boats. The weight (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
a. Compute the range
b. Compute the mean deviaton
c. Compute the standard deviation