exam Maths Puzzle Numerical Ability

A sample of 25 electric motors is taken from a large lot. The average current drawn by each motor at rated speed and RPM is 7.65 amps. The standard deviation of the sample is 0.1

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Please solve the equation. 15x+24=8(10+3x)-2.
Thanks for the help! 54. Science and medicine. A bicyclist rode into the country for 5 h. In returning, her
speed was 5 mi/h faster and the trip took 4 h. What was her speed each way?