exam Maths Puzzle Numerical Ability

Mike, louie and Joy can mow the lawn in 4,6, and 7 hours, respectively. What fraction of the yard can they mow in hour if they work together?

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exam Other Question

solve by substitution:

x-y=4
-5x+3y=6
Determine the maximum possible number of turning points for the graph of the function:
f(x)= x to the fifth power + 2x to the sixth power