exam Maths Puzzle Numerical Ability

m-2n=0
m+4n=30

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exam Other Question

graph the following inequality on a plane; 3x+4y is less than or equal to 12 Tom walked to the meeting at 2 miles per hour and caught a ride home in an old truck at 10 miles per hour. How far was it to the meeting place if his total travel time was 18 hours?