exam Maths Puzzle Numerical Ability

Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 6 hours. How much time would it take for them to mow the lawn together?

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exam Other Question

What is the solution to the following question "find three consecutive integers whose sum is 303" i missed cass one day and now i am confused with the steps. Simplify:
2log(base 4)4 + 3log(base 3)3^2 - log(base 4)(1/16) + log(base 10)10