exam Maths Puzzle Numerical Ability

m/n + 5m = 20

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4. Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream The sixth grade class officers: president, vice president, secretary, and treasurer will be seated in a row of four chairs at the class meeting. In how many different ways may the four officers be seated?

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